JP2001042243A - Picture display device and light beam scanner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact picture display device suitable for displaying a still picture, especially, having simple structure, easily controlled and capable of exactly performing plotting, and a picture plotting device for the display device. SOLUTION: This device is provided with a picture display board 5 where a picture is formed by emitting a light beam, a light output part 1 outputting a necessary light beam, a deflecting device 21 deflecting the light beam so as to scan a 1st surface, a 1st optical system 22 being an optical system fixed with respect to the device 21 and reflecting the light beam made incident in parallel with the display board 5 so as to emit the display board 5, and 2nd optical systems 41, 42, 43 and 44 guiding the light beam deflected by the device 21 to the system 22 while keeping an optical distance constant. The device 21 and the optical system 22 are moved nearly in parallel with the display board 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device and a light beam scanning device for forming an image on an image display plate having a function of holding a display state of image information, and more particularly to an image display device and a light beam suitable for displaying a still image. It relates to a scanning device.

[0002]

2. Description of the Related Art Conventionally, CRTs, plasma displays, liquid crystal displays and the like have been used as displays for displaying image information. However, these conventional displays have a display resolution of 100 dpi or less,
It does not satisfy the minimum resolution of the human eye under the conditions of use. For this reason, there is a problem that a burden is imposed on the user's visual ability when displaying fine characters and the like. In addition, since it does not have a function of adjusting to an ambient lighting environment, it is not possible to maintain appropriate luminance, and this also imposes a burden on the user's visual ability. Also, many displays require several to several tens of seconds per second to make moving images such as movies look natural.
Since the display screen is redrawn at the speed of 0 frame,
Large energy consumption.

However, electronic books that display newspaper articles and dictionary data, or HTML (Hy
There are many cases where a user wants to view a still image such as a text (per Text Markup Language) via an electronic display. Ideally, a display for displaying character information or a still image has the same optical characteristics as ordinary printed matter. Optical characteristics of the printed material include a white scatterer having high reflectance, a high-contrast character display capability, and a low viewing angle dependency. The most frequently used paper for printing is a reflector,
There is a self-adjustment function in which the luminance changes according to the change in the ambient lighting. The reflectance is as high as 60% or more for newspaper and 80% for coated paper. Therefore, when viewed in a bright place, the brightness is high and the burden on human visual ability is small. Furthermore, in the case of printed matter, 300 to 600 dpi
Since it is formed with the above high resolution, it can be recognized as a continuum beyond the minimum resolution of human vision even when viewed directly at a close distance of 30 to 60 cm, and also in this respect, there is little burden on visual ability. When a still image is to be displayed, it is not necessary to convert the moving image into a moving image. Therefore, the energy of redrawing on a conventional display is wasted.

As a display realizing a high resolution equivalent to that of a printed matter, the resolution on a chip developed by IBM Corporation is 15
There is a liquid crystal light valve type display that reaches 00 dpi (Paul M. Alt; Conference Record of the 1997
International Display Research Conference and Inte
rnational Workshop on LCD Technology and Emissive
Technology (1997), M-19). Since the liquid crystal light valve system cannot produce a display having a size larger than a Si wafer, it can be used as an element of a projection display, but cannot be used as a direct-view display. In addition, it does not have a self-adjustment function for the surrounding lighting environment, and always consumes energy by redrawing an image.

[0005] In particular, a display for displaying a still image is required to be of a reflective type, having a high luminance, a high resolution, and of not wasting energy for refreshing the screen except when rewriting display information. You. As a device that satisfies such demands, there is a reflective display that does not require refreshing by providing a liquid crystal display panel with a memory function. For example, M. According to the teachings of Pfeiffer et al., The cholesteric liquid crystal's focal conic mode part becomes cloudy by selecting the applied voltage, and the planar mode part becomes darker by absorbing light in the visible light absorbing layer on the back, resulting in high contrast. However, in this display, if the pixel size is reduced in order to achieve high resolution, the electrode panel must also be miniaturized, and the influence of the electric field on adjacent pixels may occur. Or the processing cost increases.

The liquid crystal display panel used in the projector has a high resolution and high contrast display by forming a liquid crystal display panel which can be addressed by a laser as disclosed in Japanese Patent Application Laid-Open No. 1-250926. Some are available. A display that does not require fine processing of electrodes includes a spatial light modulator. This display is a display that collectively exposes image information or forms an image by high-definition drawing using a laser. Since the entire display is formed by a pair of electrodes facing each other, fine processing is not required. However, when these displays are made direct-view type, since the paper white light scattered by the liquid crystal and the mirror reflected light that is not scattered are directly viewed, the white paint is placed on the mirror instead of a monochrome image like printed matter. The image will look like writing letters.

The applicant of the present application has already filed Japanese Patent Application No. 9-348177.
And Japanese Patent Application No. 10-71890 disclose an image display device which is capable of displaying a high-resolution image while being of a reflection type and is easy to manufacture. The inventions disclosed in these publications cause a phase transition or a change in orientation state accompanied by a change in reflectance and transmittance by heating and absorb the visible light and an image recording layer on which image information is formed by maintaining the state. An image display device which includes a visible light absorbing layer and has a function of holding a display state of image information and a drawing device, and is particularly suitable for displaying a still image. The disclosed image display device can display an image by heating a desired portion of the image recording layer of the image display plate using, for example, a laser and causing a phase transition accompanied by a change in reflectance and transmittance. . Since the state after this phase transition is maintained, once written, the displayed content can be maintained. In addition, since switching is not performed for each pixel, high-resolution display can be performed without being limited by the size of the electrode.

However, although the disclosed image display device has a simple structure, it is difficult to obtain a uniform image over the entire screen because the focused area of the laser beam depends on the position on the image display plate. There was a problem. In order to solve this problem, the applicant of the present application has disclosed in Japanese Patent Application No. 10-99016 that a drawing mechanism for deflecting a laser beam is mounted on a moving mechanism and is moved in parallel with the image display plate so that the light condensing position is always kept. An image display device disposed in an image recording layer is disclosed. However, when performing laser drawing on a large screen using the image display device disclosed in Japanese Patent Application No. 10-99016, the scanning angle of the deflecting device becomes extremely large due to the short focal length, and the conventional deflector is not applicable. There are problems such as difficulty. In addition, in order to reduce the scanning angle of the deflecting device, the moving mechanism itself becomes large in order to increase the focal length, which causes a problem that it is difficult to reduce the size of the whole drawing apparatus.

The applicant of the present application has further filed Japanese Patent Application No. 10-111.
No. 972, as an image display device which solves these problems, a light emitting portion of laser light or a light emitting portion of guided laser light is mounted on a moving mechanism and the image recording layer is directly scanned while scanning the entire image display plate. An improved version for irradiation has been disclosed. However, in the case of using the image display device disclosed in Japanese Patent Application No. 10-111972, it is necessary to provide a light emitting unit or a light emitting unit having a light collecting mechanism between the moving mechanism and the image display plate. In addition, the thickness of the image display device cannot be reduced, and there is a restriction on miniaturization of the device. Further, there is a problem that the drawing time becomes long because the moving mechanism scans the entire display screen.

[0010]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a small-sized image display device which is particularly suitable for displaying a still image, has a simple structure and control, and can draw accurately. An object of the present invention is to provide an image drawing device for that purpose.

[0011]

In order to solve the above-mentioned problems, an image display apparatus for displaying image information according to the present invention comprises:
An image display plate capable of forming an image by irradiating a light beam, a light output unit for outputting a required light beam, a deflecting device for deflecting the light beam so as to scan in a first axial direction, and a deflecting device. A first optical system which is a fixed optical system and deflects a light beam incident parallel to the image display plate to guide the light beam to the image display plate; and a light beam deflected by the deflecting device is orthogonal to the first axial direction. A second optical system for guiding the first optical system while keeping the optical path length of the second axial component constant, such that the deflecting device and the first optical system are moved substantially parallel to the image display plate. It is characterized by having done.

According to the present invention, when an image is drawn on the image display plate, scanning is performed in the first axis direction of the two-dimensional screen by the deflecting device, and the second axis position is determined by the position of the first optical system. Since the light beam traveling in the second optical system always has a substantially constant optical path length of the second axial component, the position and scanning angle of the first optical system can be reduced by using a simple condensing optical system. Even if it changes, the spot size of the light beam at the image forming layer position of the image display plate can be kept constant, and the light beam can be collected, irradiated, and scanned over the entire area of the image display plate. Further, since the optical path length from the deflecting device to the image display plate can be increased, the deflection angle required for the deflecting device is small. Further, since the first optical system only needs to change the direction of the light beam and irradiate the image forming plate, the distance to the image forming plate may be short, and the thickness of the image display device may be reduced.

The image forming apparatus further includes a scan lens and a second optical system including a group of reflecting mirrors disposed at both ends of the image display plate.
The light is deflected in the axial direction, and the light is reflected by one end of the reflecting mirror group and the other end of the reflecting mirror group, and finally guided to travel in a second plane substantially parallel to the image display panel. Thus, the light may be incident on the first optical system. With the scan lens, the light beam deflected by the deflecting device can be focused on the image display plate regardless of the scanning angle. In such a configuration, the space to be secured on the back side of the image display panel becomes narrow, so that the thickness of the device is reduced and the device can be downsized. Further, both the first optical system and the second optical system can be constituted by simple optical elements, and the deflecting device and the moving mechanism on which the first optical system is mounted are simple and the production cost and operation cost are small. In addition, it is also possible to introduce a cylindrical lens that moves together with the deflecting device or the like, and converge the light beam in a direction different from that of the scan lens. In this case, the width of the light beam in the thickness direction of the device is reduced, and the size of the device is easily reduced.

Further, the light beam scanning device according to the present invention comprises: a light output unit for outputting a light beam; a deflecting device for deflecting the light beam to scan a plane substantially parallel to a predetermined surface in a first axial direction; A scan lens that condenses the light beam deflected by the deflecting device on a surface at a predetermined distance regardless of the scanning angle, and guides a light beam incident from a second surface substantially parallel to the predetermined surface to the predetermined surface A light beam passing through the first optical system and the scan lens travels in the second plane and enters the first optical system while substantially maintaining an optical path length of a second axial component orthogonal to the first axis. A second optical system that guides light to the first optical system, wherein the deflecting device, the scan lens, and the first optical system move in a direction substantially parallel to a predetermined surface while maintaining a fixed positional relationship with each other. The second surface of the optical path length of the light beam traveling in the system is kept substantially constant in a predetermined plane. Characterized in that so as to scan the light beam.

With the light beam scanning device according to the present invention, it is possible to scan the entire plane evenly while maintaining the light condensing position of the light beam from the light output section on a predetermined plane. By arranging the image forming plate on the light-collecting plane, a high-resolution image display device can be obtained.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an image display device and a light beam scanning device according to the present invention will be described in detail based on embodiments with reference to the drawings. FIG. 1 is a side view illustrating the principle of an image display device according to an embodiment of the present invention, and FIG. 2 is a plan view thereof.

The image display device has an optical output unit 1 for emitting a laser, an optical system moving mechanism 2 mounted and moved with an optical system, an optical system for reciprocating the laser in the device, and an image for receiving and displaying the laser. It consists of a display panel 5. The laser light emitted from the light output unit 1 is deflected by the mirror 23 and enters the optical system moving mechanism, that is, the optical scanning mechanism disposed on the automatic stage 2, that is, the deflecting device 21. Scanning is performed in a parallel first axis direction (X-axis direction), and emission is performed in a second axis direction (Y-axis direction) perpendicular to the scanning direction.

The laser beam scanned in the X-axis direction and emitted in the Y-axis direction is turned back by optical elements (mirrors A and B) 41 and 42 provided outside one end face of the image display plate 5, and the other side. The optical element (mirror C,
D) The light enters the image display devices 43 and 44, is turned back, is guided along the image display plate in the image display device, and then returns to the automatic stage 2 again. The scanning laser light is incident on a mirror E22 which is long in the X-axis direction, reflected upward (in the Z-axis direction), and condensed on the image display plate 5. The image display plate 5 is a liquid crystal display plate that changes its phase by heat, and the portion of the liquid crystal layer irradiated with laser from the back side becomes cloudy, for example, to form an image.

Each of the mirrors 41, 42, 43, 44 and 22 has a long columnar shape to cover the scanning width of the laser beam. Further, since the mirrors are arranged in parallel with each other, the Y-axis component of the optical path length does not change while the laser light travels between these mirrors and returns to the automatic stage 2 even when the automatic stage 2 moves. In addition, the image display board 5
Deflecting device 2 required to scan the length in the X-axis direction
The scanning angle θs of the laser light at 1 corresponds to the width of the image display plate 5 in the X-axis direction with respect to the distance after the laser light travels along the image display plate 5 and reaches the liquid crystal layer in the image display plate 5. Therefore, it is extremely small as compared with the conventional device. The image display device controls the laser light source 1 that emits laser light in accordance with an image signal while deflecting and scanning the laser light in the X-axis direction and running the automatic stage 2 in the Y-axis direction. And an arbitrary image is formed on the display surface. A person can observe an image from the front side of the image display plate 5.

FIG. 3 is a plan view showing a specific example of the arrangement of the image display device with its front face removed. An image display plate 5 is fitted in the front of a housing 6 of the image display device. Mirrors 41 and 4 long in a columnar shape on both outer sides of the image display panel
2, 43 and 44 are arranged. An optical output unit 1 including a laser generator 11 and a reflecting mirror 12 is provided at a corner of the housing 6 so that emitted laser light is incident on a reflecting mirror 23 mounted on the automatic stage 2. .

A pair of linear guides 33 is provided with the image display plate 5 interposed therebetween, and the automatic stage 2 is mounted so as to straddle the linear guide slider 32, and the end of the image display plate 5 is arranged in the Y-axis direction. The translation can be performed smoothly from to the edge. A DC motor 35 to which an encoder 34 is connected is provided at a corner of the housing 6.
To control the rotation of A toothed belt 37 engaged with the automatic stage 2 is suspended between the pulley 36 and the pulley 38 at the other end, and drives the automatic stage 2 back and forth. The position of the automatic stage 2 can be accurately known by the encoder 34.

When a laser beam is condensed using an ordinary lens, if the focal length is to be increased in order to reduce the scanning angle of the deflecting device, the wavelength of the laser beam and the required spot diameter are determined. The diameter of the laser light in the apparatus, the laser light in the mirror arranged outside the image forming plate 5, and the diameter of the laser light traveling back and forth in the apparatus are increased. For this reason, a commonly used deflection device cannot be used, and an image drawing device for drawing on an image forming plate becomes thick, so that the device becomes expensive and large. The image display device of the present invention can further reduce the laser beam incident on the deflecting device and reduce the thickness of the image drawing device by separately and independently performing focusing in the lateral direction and the thickness direction. .

FIG. 4 is a diagram for explaining a mechanism for condensing the laser light vertically and horizontally independently. In the direction parallel to the image display plate 5, that is, in the scanning direction, as shown in FIG. 4B, even if the incident angle is different, the scan lens 30 for condensing the laser beam on a plane at a predetermined distance is provided with a deflecting device. The arrangement after 21 makes it easy to always maintain a constant spot size at the position of the image display plate 5. On the other hand, in the direction perpendicular to the image display plate 5, that is, in the thickness direction of the device, the width of the mirror and the width of the laser traveling portion determine the thickness of the image display device. Is preferred. Therefore, as shown in FIG. 4A, a laser beam having a smaller vertical width than the horizontal width is incident, condensed by an optical system, and an optical element is arranged at a position where the width of the laser beam is small. It is preferable that the light is focused so that a laser diameter comparable to the diameter in the direction is formed in the image display plate 5.

As described above, since the optical processing in the thickness direction of the laser beam is different from the optical processing in the lateral direction, an optical system having a different configuration composed of a cylindrical lens which does not reach the light condensing power in the direction parallel to the image display plate 5 is used. . To make the width in the thickness direction small enough to dispose an optical element that is sufficiently small while the laser light travels inside the image display device, and to secure a spot size comparable to the horizontal direction on the image display plate 5. It is preferable to use two-stage converging lenses 24 and 31 for this purpose. A second distance farther from the focal point of the first lens 24
By disposing the lens 31, the optical element is disposed in a narrow place close to the focal point of the laser light to be diffused after the light is once converged, and the laser light that is expanding through the focal point is focused again. Then, the light is projected on the image display plate 5 so that the convergence angle can be made larger than a predetermined value.

That is, focusing is performed in the thickness direction by a cylindrical lens (lens A) 24 disposed in front of the deflecting device 21, the laser beam is scanned by the deflecting device 21, and then laterally scanned by a scan lens (lens B) 30. Focus in the direction. The focus of the scan lens 30 is set at the position of the liquid crystal layer in the image display plate 5. The scanned laser beam is a thin optical system (mirrors A, B, C, D)
After returning to the automatic stage 2 around 41, 42, 43, 44, the image display plate 5 is again focused in the thickness direction by a cylindrical lens (lens C) 31 mounted on the automatic stage 2, and Incident on. The focal point of the cylindrical lens 31 is set at the same position of the liquid crystal layer as described above.

As described above, by dividing focusing in the thickness direction into multiple stages, it is possible to use a normal deflection device and to reduce the thickness of the device. In the image scanning apparatus of the present invention, a constant optical path length is maintained even when the automatic stage 2 moves, so that an optical system independent of two axes can be easily designed as described above.

A specific design example in which an A4 size (297 mm × 210 mm) image display device is accommodated in a thickness of about 24 mm will be described. The table below is an example of three lens designs.
The unit of the numerical value in the chart is mm. The incident light beam is an elliptical collimated laser having a width of 11 mm and a length of 6 mm in the thickness direction. Note that the lens is made of polystyrene, between the lens A24 and the deflecting device 21, between the deflecting device 21 and the lens B30, and between the lens B30 and the lens C3.
During 1, the optical distances between the lens C31 and the image display plate 5 were set to 40 mm, 65 mm, 600 mm, and 19 mm, respectively.

[Table 1]

FIGS. 5, 6 and 7 show the optical system of the automatic stage 2 which realizes the optical arrangement thus obtained. FIG. 5 is a plan view of a deflecting device according to an embodiment of the present invention.
FIG. 6 is a front view of a deflection device portion of the automatic stage, and FIG. 7 is a side view of the automatic stage. The laser light emitted from the light output unit 1 fixed to the image display device in accordance with the image signal always reflects the mirror 23 of the automatic stage 2 even during traveling.
And is deflected here and converged in the thickness direction by a cylindrical lens (lens A) 24 installed in the horizontal direction.
The light enters the deflection device 21.

The deflecting device 21 includes a deflector 26, a first reflecting mirror 25 installed on the incident side thereof with a predetermined inclination,
The second reflecting mirror 27 and the deflector 2 installed downward on the upper surface
6, a third reflecting mirror 28 installed symmetrically with the first reflecting mirror 25 with the same inclination as the first reflecting mirror 25, and a fourth reflecting mirror 29 installed vertically. The laser light that has entered the deflecting device 21 is reflected by the first reflecting mirror 25 and the second reflecting mirror 27 and is incident substantially at the center of the deflector 26. The optical path length between the lens A24 and the deflector 26 is set to be 40 mm.

The deflector 26 uses a resonance type galvano scan for miniaturization, and the mirror surface for reflecting the light beam vibrates within a predetermined angle, and the reflected light scans back and forth at a constant speed. The scanning light is reflected by the second reflecting mirror 27 and the third reflecting mirror 28 and is incident on the fourth reflecting mirror 29, and is incident on the scanning lens 30 which is reflected and converges in the horizontal direction. The scanning light beam transmitted through the scan lens 30 travels in a plane substantially parallel to the image display plate 5 and passes through mirrors A, B, C, and D, lens C and mirror E, and is separated by an optical distance of 619 mm. The focal point is formed in the image display plate 5 disposed at the position.

The lens C31 and the mirror E22 are installed on the upper surface of the automatic stage 2, and converge and deflect the laser light incident on the mirror D44 in the thickness direction (Z-axis direction). Collect light. The mirror E22 has a length substantially equal to the width of the image display plate 5. It is preferable that the light rays enter the image display plate 5 almost perpendicularly, but it is not limited to a right angle. Also, automatic stage 2
In order to reduce the scanning range, the inclination of the mirror E22 may be adjusted according to the position with respect to the image display plate 5.

FIG. 8 is a cross-sectional view of the image display device constituted by the above mechanism, which is cut at the position of the automatic stage.
The image display device for displaying the A4 size (210 mm x 297 mm) is a compact casing 6 of 236 mm x 337 mm x 24 mm.
It is stored in.

In this embodiment, a galvano scanner is used as a deflector. However, other deflectors such as a mechanical optical deflector such as a bimorph mirror using a polygon mirror or an electrostrictive element, and a deflector using an electro-optic effect are used. An optical deflector may be used. Further, in this embodiment, the laser light is reciprocated one time before the laser beam is incident on the image display device from the scanning deflection device. However, the laser light may be reciprocated many times depending on the size and arrangement of the image display plate. Needless to say. In this embodiment, the laser beams are vertically reflected by the mirrors A, B, C, and D, respectively. However, since the optical distance may satisfy a predetermined condition, the reflection angle is appropriately selected. For example, the mirror B or C can be omitted. Further, in the drawings describing the present embodiment, the position of the deflecting device is displayed so as to be substantially at the center in the width direction of the image display device, but may be shifted to any one.

[0034]

As described in detail above, in the present invention,
By scanning the light beam output from the light output device with an optical scanning device moving integrally with the optical system moving unit, and passing the inside of the image drawing device through an optical path formed along the image display plate, Even if the scanning angle of the deflecting device is small, it is possible to condense and scan a large area. Further, since the focal length does not change, it is possible to use a conventional light collecting device without using a special light collecting device. Further, since the focal length is long, the scanning angle becomes small, and a conventional deflector can be used. As described above, according to the present invention, an image drawing apparatus can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a side view illustrating the principle of an image display device according to the present invention.

FIG. 2 is a plan view illustrating the principle of the image display device according to the present invention.

FIG. 3 is a plan view showing a specific arrangement example of the image display device according to the present invention, with a front surface removed.

FIG. 4 is a diagram illustrating a mechanism for converging laser light independently in the vertical and horizontal directions according to the present invention.

FIG. 5 is a plan view of a deflecting device according to an embodiment of the present invention.

FIG. 6 is a front view of a deflecting device portion of the automatic stage in the present embodiment.

FIG. 7 is a side view of the automatic stage in the present embodiment.

FIG. 8 is a sectional view of an image display device according to one embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 light output unit 11 laser generator 12 mirror 2 optical system moving mechanism (automatic stage) 21 deflecting device 22 mirror 23 mirror 24 cylindrical lens (lens A) 25, 27, 28, 29 reflecting mirror 26 deflector 30 scan lens (lens) B) 31 cylindrical lens (lens C) 32 linear guide slider 33 linear guide 34 encoder 35 DC motor 36 pulley 37 toothed belt 38 pulley 41, 42, 43, 44 mirror 5 image display plate 6 housing

Continuation of the front page (72) Inventor Sergio Vasquez W Montier 2-7-5 Nakaochiai, Shinjuku-ku, Tokyo F-term in Hoya Corporation (reference) 2H045 AA01 AB01 AB38 CB03 DA02 DA04 DA31

Claims (7)

[Claims] 1. An image display apparatus for displaying image information, comprising: an image display plate capable of forming an image by irradiating a light beam; a light output unit for outputting the light beam; A deflecting device for deflecting the light beam to scan, an optical system fixed relative to the deflecting device, a first optical system for guiding the light beam to the image display panel, and a light beam deflected by the deflecting device A second optical system that bends the optical path along the image display plate and guides the first optical system to the first optical system. The deflection device and the first optical system are substantially parallel to the image display plate. Moving the light beam in the second axis direction by moving the light beam in the second axis direction, and the second axis direction component of the optical path length from the deflecting device to the light beam irradiation position on the image display plate during the parallel movement. The deflection device is configured so as not to change. An image display device that scans the image display plate with the light beam so as to form an image such that the spot size at each light beam irradiation position becomes constant by the scanning and the parallel movement. 2. A scanning lens further comprising: a scanning lens that converges a light beam deflected by the deflecting device on the image display plate regardless of a scanning angle while maintaining a fixed positional relationship with the deflecting device. Light rays passing through the lens are incident on the second optical system in parallel to the image display plate, and the second optical system is composed of a group of reflecting mirrors arranged at both ends of the image display plate and passes through the scan lens. The reflected light beam is reflected by one end of the reflecting mirror group and the other end of the reflecting mirror group, finally travels in a plane substantially parallel to the image display panel, and is guided to enter the first optical system. The image display device according to claim 1, wherein the light beam is condensed on the image display plate. 3. The image according to claim 2, further comprising a cylindrical lens that converges the light beam in a second direction different from the scan lens while maintaining a fixed positional relationship with the deflection device. Display device. 4. A second cylindrical lens which is fixed at a position with respect to the deflecting device and converges a light beam output from the light output portion in the second direction and makes the light beam enter the deflecting device. The image display device according to claim 2, wherein: 5. A light beam scanning device that focuses a light beam and scans the light beam on a predetermined surface, comprising: a light output unit that outputs the light beam;
A deflecting device for deflecting the light beam and scanning in a first axial direction in a plane substantially parallel to the predetermined surface; and deflecting the light beam deflected by the deflecting device on a surface at a predetermined distance regardless of the scanning angle. A scan lens that condenses light on the first surface and a first light guide that guides light rays incident from a second surface substantially parallel to the predetermined surface to the predetermined surface.
And a light beam that has passed through the scan lens is incident, and finally travels in the second plane while maintaining an optical path length component in a second axial direction orthogonal to the first axis. A second optical system for guiding light so as to be incident on the optical system, wherein the deflecting device, the scan lens, and the first optical system are substantially parallel to the predetermined surface while maintaining a fixed positional relationship with each other. In the second direction, and the second axial component of the optical path length of the light beam traveling through the second optical system is kept substantially constant so that the predetermined surface substantially matches the predetermined distance surface. A light beam scanning device, wherein a light beam is scanned on the predetermined surface by scanning by the deflection device and the relative movement. 6. The light beam according to claim 5, further comprising a cylindrical lens that converges the light beam in a second direction different from the scan lens while maintaining a fixed positional relationship with the deflection device. Scanning device. 7. A deflecting device comprising a second cylindrical lens fixed at a position relative to the deflecting device and converging a light beam output from the light output portion in the second direction and entering the deflecting device. 7. The light beam scanning device according to claim 6, wherein: