JP2001125220A - Image exposure device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image exposure device by which a photomixing by a prism is executed without the loss of a light quantity, the constitution of a driving circuit and timing control are facilitated and a color slippage is not caused even though an irregularity is caused in carrying speed. SOLUTION: Since first light and second light have wavelengths which are most separate a in wave tength among three kinds of the light, the first light is transmitted to the side of a second transparent member by a first wavelength selective optical member 24d formed so as to be held between a first transparent member 24A and the second transparent member 24B, and in the case of reflecting the second light in the same direction as that of the first light transmitted through the first wavelength selective optical member, the characteristics of sufficient transmission and reflection are obtained even though the polarizing surfaces of the firs light and the second light are not aligned. Also, since the second wavelength selective optical member 24e is formed at the boundary of the second transparent member 24B with air, the characteristics of sufficient reflection and transmission are obtained, and the first light and the second light are transmitted, and also even in the case of reflecting third light, the characteristics of the sufficient transmission and reflection are obtained even though the polarizing surface of light is not aligned.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an image exposure apparatus for exposing a photosensitive material using light emitted from a plurality of light emitting elements of a plurality of colors.

[0002]

2. Description of the Related Art There is an image exposure apparatus which includes an array light source composed of a plurality of light emitting elements for each recording color and exposes a photosensitive material (such as photographic paper).

FIG. 6 is an explanatory view showing the state of exposure of this type of conventional image exposure apparatus. Here, in order to expose the printing paper 11, array light sources 1, 2, 3 having substantially the same width as the printing paper 11 are provided. In the example shown here, each of the array light sources 1 to 3 is 20 elements ×
It is configured in a staggered arrangement of two rows (40 elements in total).

Here, the array light sources 1 to 3 emit light according to the respective recording colors of R, G, and B, respectively. When the printing paper 11 is being conveyed in the direction of the arrow in the drawing, the array light sources 1 to 3 are driven at different timings in accordance with the conveyance speed, so that the printing paper 1 is driven.
Exposure of R, G, B is performed at the same position of No. 1.

[0005] It is desirable that there is a light source capable of obtaining linear emission light having a desired density as shown in FIG. 7 at a time. For example, if a line-like outgoing light having a density of 100 dots / line is required, R
100 elements for B, 100 elements for G, and 100 elements for B are required, and it is necessary to create a light source in which 300 elements are arranged in one line in total. That is, as a light source for obtaining emission light of 100 dots / line, 300 dots / line has a desired density.

However, since the size of the light emitting element is limited, it is difficult to arrange all the elements on one line. For this reason, as described above, a configuration is adopted in which array light sources for each color are provided and exposure is performed sequentially.

In general, since the light beam from the array light source is diffused, it is necessary to form an image of the light source on the printing paper surface or to bring the light source into close contact with the printing paper. In order to achieve such close contact, and also to form an image of the light source on photographic paper, the brightness of the image is reduced if the image forming surface is separated, so that as a practical problem, as shown in FIG. Exposure was required to be performed by shifting the position every one to three.

In the case of performing the exposure in which the position is shifted for each recording color, it is necessary to shift the timing of the drive signal supplied to each of the array light sources 1 to 3 in accordance with the transport speed. Therefore, there is a problem that the configuration of the drive circuit and the timing control are complicated.

[0009] Further, if the conveyance speed becomes uneven after the exposure of one recording color and before the exposure of the same pixel to another color, a color shift occurs. Therefore, in order to prevent color misregistration, the transport speed of the photographic paper 11 must be strictly controlled.

Further, the photographic paper 11 in a direction perpendicular to the conveying surface is provided.
The fine movement causes a change in the size of the image of the pixel on the photographic paper and causes color unevenness. Therefore, it is necessary to accurately maintain the position of the transport surface. However, a mechanism for accurately maintaining such a transport surface is required for each of the three light sources, or in a range (a range A in FIG. 8) covering all the light sources. Further, a mechanism for suppressing the movement in the direction perpendicular to the transport direction in the transport plane until the exposure of another color for the same pixel is required.

That is, as shown in FIG. 8, when the array light sources 1 to 3 are recorded side by side for each recording color, the range A is widened, so that exposure without color shift and color unevenness is difficult. there were.

Further, in order to correct the exposure amount, it is necessary to provide light receiving means at a position corresponding to each recording head. In this case, there is a problem that three light receiving means are required.

[0013]

In order to solve the above-mentioned problems, a prism (dichroic prism) having a wavelength-selective optical member as a light-selective film is used. It is conceivable to mix the output lights in an array.

FIG. 9 is a schematic view showing a state in which light is mixed by the dichroic prism 6. The linear array light sources 1 to 3 and the dichroic prism 6 extend in the direction perpendicular to the plane of FIG.

Here, the dichroic prism 6 for performing light mixing includes a first transparent member 6A, a second transparent member 6B, and a third transparent member 6C. Then, between the first transparent member 6A and the second transparent member 6B, a light selective film 6d as a first wavelength selective optical member that selectively transmits or reflects according to the wavelength of light is disposed. ing. Similarly, between the second transparent member 6B and the third transparent member 6C, a light selective film 6e as a second wavelength selective optical member that selectively transmits or reflects according to the wavelength of light is disposed. Have been.

By using such a dichroic prism 6, the linear light emitted from the array light source 1 passes through the transparent members 6A to 6C and the light selection films 6d and 6e, and the linear light emitted from the array light source 2 is formed. The emitted light is reflected by the light selection film 6d and transmits through the transparent members 6B and 6C, and the linear emission light from the array light source 3 is reflected by the light selection film 6e and transmits through the transparent member 6C. The three line-shaped outgoing lights are combined into one line.

By the way, the light selective films 6d, 6
Since e is provided at a portion sandwiched by glass, it is very difficult to manufacture it for the following reasons. In particular, in order to transmit light from one side and reflect light from the other, to provide a light-selective film having a property of selectively transmitting or reflecting according to the wavelength of light to have sufficient characteristics,
The light selective film needs a certain thickness.

Further, since there is no difference in the refractive index between the glass and the portion different from the interface with air, a more complicated layer structure is required to obtain the required characteristics, and a structural problem is large. .

In particular, the above-mentioned phenomenon occurs remarkably when the polarization plane of light is not aligned in a certain direction. FIG.
FIG. 4 is a characteristic diagram showing characteristics of light transmittance when the light selective film sandwiched between the glasses is assembled with a small number of layers. Here, for light whose polarization plane is an S-wave,
Transmission and reflection are performed at a boundary of 550 nm (the characteristics indicated by the solid line). However, for light whose polarization plane is a P-wave, 42
The reflection and transmission characteristics are switched around 0 nm to 450 nm (dot-dash line characteristics).

As a result, the light in which the P wave and the S wave intersect has a characteristic in which P and S are averaged as shown in the AV of FIG. 10, and is in an intermediate state between transmission and reflection (half state). (Transmission / semi-reflection) (characteristics indicated by broken lines).

For this reason, when light mixing is performed using light in which P-waves and S-waves intersect using the dichroic prism 6 as shown in FIG. Then, there arises a problem that the light utilization rate (efficiency) drops to about 50%.

Further, by using a polarizing filter to make only S-waves just before the light enters the dichroic prism 6, transmission and reflection can be performed efficiently, but the amount of light decreases at the stage of passing light through the polarizing filter. Problems arise.

In the above characteristics, reflection and transmission can be efficiently performed by bringing the characteristics of the P wave and the S wave closer to each other. However, for that purpose, it is necessary to increase the thickness of the light-selective film. It is difficult to create in the sandwiched part.

For the reasons described above, when light is mixed by a dichroic prism using a light selective film sandwiched between glass, a loss of light quantity cannot be avoided and satisfactory characteristics cannot be obtained.

The present invention has been made in view of the above technical problems, and performs light mixing by a prism without loss of light amount, facilitates the configuration of a driving circuit and timing control, and causes unevenness in a transport speed. It is another object of the present invention to provide an image exposure apparatus which does not cause color shift.

[0026]

That is, the present invention for solving the above problems is as described below. (1) The invention according to claim 1 is an image exposure apparatus for exposing an image on a photosensitive material using light from a plurality of light emitting element arrays, wherein different light emitted from the first to third light emitting element arrays is used. A light mixing unit that mixes light of wavelengths to form linear emission light mixed on the same line; and a component perpendicular to an exposure line formed by exposing the linear emission light to a photosensitive material. Moving means for moving at least one of the photosensitive material or the light mixing means so that the exposure line moves in the direction having the first light-emitting element array and the second light. The second light from the light emitting element row is 3
The light mixing means is a light having the largest wavelength among the two lights, and the light mixing means is interposed between the first transparent member, the second transparent member, and the first transparent member and the second transparent member. A first wavelength-selective optical member that is formed and selectively transmits or reflects according to the wavelength of light, and is formed at the interface between the second transparent member and air and is selectively formed according to the wavelength of light. A second wavelength-selective optical member that transmits or reflects light from the first light-emitting element array, receives the first light emitted from the first light-emitting element array, and receives the first light from the second light-emitting element array. The emitted second light is received by a second transparent member, and the first wavelength-selective optical member allows the first light to pass through the second transparent member, and the first light is transmitted to the second transparent member. Reflecting the second light in the same direction as the first light transmitted through the wavelength-selective optical member; The second wavelength-selective optical member transmits and emits the first light and the second light, and the first light and the second light are emitted in the same direction as the emitted first light and the second light. An image exposure apparatus that reflects the light of No. 3 above.

According to the present invention, the first light from the first light emitting element array and the second light from the second light emitting element array have the largest wavelengths among the three lights. The first wavelength-selective optical member formed between the first transparent member and the second transparent member transmits the first light to the side of the second transparent member, and transmits the first light to the first transparent member. When reflecting the second light in the same direction as the first light transmitted through the wavelength-selective optical member, sufficient transmission and reflection characteristics even if the polarization planes of the first light and the second light are not aligned. Is obtained.

Further, the second wavelength-selective optical member includes a second wavelength-selective optical member.
Is formed at the interface between the transparent member and the air, and is not sandwiched between the transmitting members. Therefore, it is possible to obtain sufficient reflection and transmission characteristics, and it is possible to configure the first light and the second light.
In the case where the third light is reflected while the third light is transmitted, sufficient transmission and reflection characteristics can be obtained even if the polarization planes of the light are not uniform.

That is, light from a plurality of light emitting element rows can be mixed without attenuating to form a linear emitted light. Therefore, the light beams from each array light source are combined into one and exposed as one line, so that the light is mixed by the prism without loss of light amount, the configuration of the drive circuit and the timing control are simplified, and the transport speed is improved. Even if unevenness occurs, even if movement in the direction perpendicular to the transport direction in the transport surface occurs, color shift does not occur,
An image exposure apparatus with a simple mechanism for maintaining the transport surface can be realized.

Preferably, the light mixing means is a prism having optical characteristics depending on the wavelength of light.
The wavelength-selective optical member is desirably a light-selective film that causes transmission and reflection depending on the wavelength of light.

[0031]

Embodiments of the present invention will be described below in detail. Note that the present invention is not limited to the embodiment shown in the specification of the present application.

First, an overall configuration of an image exposure apparatus used in the first embodiment will be described with reference to FIGS. Here, FIG. 1 is a perspective view showing a main part of the image exposure apparatus according to the first embodiment, FIG. 2 is a side view showing an entire configuration of the image exposure apparatus according to the first embodiment, and FIG. FIG. 2 is a side view illustrating a configuration of a main part of the image exposure apparatus according to the first embodiment.

In FIGS. 1 and 2, reference numeral 10 denotes a paper magazine holding a roll of photographic paper 11;
2a and 12b are a pair of drive rollers for transporting the photographic paper 11 at a predetermined transport speed, 12c and 12d are a pair of drive rollers for transporting the photographic paper 11 at a predetermined transport speed, and 13 is an exposed photographic paper. It is a cutter for cutting into a predetermined size.

It should be noted that the printing paper 1 in this embodiment is
Reference numeral 1 denotes one of the photosensitive materials. In the first embodiment, a material that exposes the photographic paper 11 is used as a specific example.

Reference numeral 21 denotes a first light-emitting element formed by an array of light-emitting elements for exposing a first color (for example, R).
An array light source 22 is a second array light source composed of an array of light emitting elements for exposing a second color (for example, B), and 23 is an array light emitting element for exposing a third color (for example, G). Is a third array light source composed of: Here, of the three lights, the light having the farthest wavelength is used as the first array light source and the second array light source.

Reference numeral 24 denotes a dichroic prism as a light mixing means for mixing light beams from an array light source for each recording color and emitting light beams for each recording color through the same path. Reference numeral 25 denotes each recording color mixed by the dichroic prism 24. Is a cell hook lens array as light focusing means for focusing the light flux on a photosensitive material.

It is assumed that the first to third array light sources 21 to 23 are constituted by a staggered array light source similar to a conventional array light source. Note that the dichroic prism 24 in FIG. 1 described above has a configuration as a principle diagram, but has a specific configuration as shown in FIG.

That is, the first transparent member 24 having the incident end 24a for receiving the light beam from the first array light source 21
A, incident end 2 for receiving light from second array light source 22
The second transparent member 24B having the first transparent member 4B is formed between the first transparent member 24A and the second transparent member 24B and selectively transmits or reflects according to the wavelength of light. And a second wavelength-selective optical member 24e formed at the interface of the second transparent member 24B with the air and selectively transmitting or reflecting according to the wavelength of light. Have been. Here, the transparent members 24A and 24B have the same cross-sectional shape.

When the first array light source 21 and the second array light source 22 are viewed through an imaging system provided on the emission side, the first array light source 21 and the second array light source 22 It is desirable that the entrance surface be at an angle such that decentering aberration due to the inclined exit surface of the prism is minimized.

Then, the first light emitted from the first array light source 21 is received by the first transparent member 24A, and the second light emitted from the second array light source 22 is received by the second transparent member 24B. And the first wavelength-selective optical member 24d allows the first light to pass through the second transparent member 24B and the first wavelength-selective optical member 2d.
4d, the second light is reflected in the same direction as the first light transmitted through the second wavelength selective optical member 24e.
Thereby, the first light and the second light are transmitted and emitted, and are emitted from the third array light source 23 in the same direction as the emitted first light and the second light. By reflecting the third light, light mixing is performed.

Here, the array light source means a light emitting element array in which light emission can be controlled independently at a portion corresponding to each pixel. For example, an independent light source is provided for each pixel. Device array including a plurality of light-emitting devices (e.g., LEDs) that can be controlled to emit light, and a light-emitting device (VFPH) that combines a shutter device and a single light-emitting device that can be controlled independently at a portion corresponding to a pixel Etc.) can be used.

The outgoing light mixed by the dichroic prism 24 is configured to be focused on the photographic paper 11 and exposed by the cell hook lens array 25 as shown in FIGS.

FIG. 4 is a functional block diagram showing an electrical configuration of the image exposure apparatus according to the first embodiment. In FIG. 4, the same components as those in FIGS. 1 to 3 described above are denoted by the same reference numerals.

In FIG. 4, reference numeral 30 denotes a CPU as a control means for controlling each unit, and 31 denotes a head driver control circuit (HDC circuit) which receives image data from the outside and generates an image signal for driving an array light source for each color. ), 41
A head driver circuit (HD circuit) that receives a first color image signal from the HDC circuit 31 and generates a light emission signal for causing the light emitting element of the first array light source 21 to emit light in accordance with the gradation;
Reference numeral 42 denotes a head driver circuit (HD circuit) that receives an image signal of the second color from the HDC circuit 32 and generates a light emission signal that causes the light emitting element of the second array light source 22 to emit light in accordance with the gradation. A head driver circuit (H) that receives an image signal of the third color from 33 and generates a light emission signal for causing the light emitting element of the third array light source 23 to emit light in accordance with the gradation
Reference numeral 50 denotes a photographic paper transport mechanism including a drive motor and drive rollers 12a and 12b and 12c and 12d.

Here, the operation of the thus configured exposure apparatus of the first embodiment will be described. First, CPU
Reference numeral 30 sends out the photographic paper 11 at a predetermined speed by the photographic paper transport mechanism 50.

In FIG. 4, color image data from an external camera, an image processing circuit or the like is decomposed by the HDC circuit 31 into color-specific image signals. In this case, conventionally, the timing of light emission is shifted for each color in accordance with the arrangement of the array light sources and the transport speed of the photographic paper 11, but the first embodiment does not need to shift the timing. That is, the image signals for each color are supplied to the HD circuits 41 to 43 at the same timing. For example, HDC
The circuit 31 performs R, B, and G color separation, and supplies the R image signal to the HD circuit 41, the B image signal to the HD circuit 42, and the G image signal to the HD circuit 43.

The HD circuits 41 to 43 receiving the image signals of the respective colors at the same timing respectively receive the image signals of the respective colors from the HDC circuit 31 and change the light emitting elements of the array light source in accordance with the gradation of the image signals. A light emission signal to emit light is generated. Then, the first to third array light sources 21 to 23 which have received such light emission signals from the HD circuits 41 to 43 emit light at the same timing according to the image signal for each color.

In the first embodiment, R, B,
Light emission is performed at the same timing in exposure of each color of G, and light emission is also performed at the same timing for each column in a staggered arrangement by the array light sources of each color.

The light emitted from the first array light source 21 to the third array light source 23 at the same timing enters the dichroic prism 24 from a plurality of incident ends. Then, by the transmission and reflection of light in the wavelength-selective optical member 24d and the wavelength-selective optical member 24e of the dichroic prism 24, incident lights of a plurality of colors are mixed and output as output light from one output end.

That is, the first array light source 21 in a staggered arrangement
The incident light from the third array light source 23 is mixed, so that the output light from the output end is aligned even if the array light sources are in a plurality of rows, and R, B , G are obtained in a state where the array light sources for the individual colors are aligned, and linear light is emitted simultaneously for each color.

That is, conventionally, the timing adjustment for each array light source in a plurality of rows, the timing adjustment for the arrangement of each color of RBG, and the movement in the direction perpendicular to the transport direction in the transport plane for exposing each color are performed. A mechanism that requires a suppressing mechanism is not required in the first embodiment.

Therefore, the light beams from the array light source for each recording color are combined into one and exposed as one line, so that the light is mixed by the prism without loss of light amount, and the configuration of the drive circuit and the timing control are performed. And an image exposure apparatus that does not cause color misregistration even when the transport speed becomes uneven.

That is, unlike a laser beam that reaches a long distance without being diffused like a laser beam, the light beam from each array light source is matched on the photographic paper 11 even though the light beam has a strong diffusivity. It becomes possible to do.

Also, since light beams of a plurality of recording colors are mixed and emitted at the same timing, it is possible to minimize the phenomenon that other colors emit light due to a phenomenon called sub-absorption of the photosensitive material. become.

The photographic paper 11 which has been exposed based on the image data is cut into a predetermined size by a cutter 13 and developed by a developing device (not shown). In this embodiment, the first light is transmitted to the side of the second transparent member 24B and the first wavelength-selective optical member 24d.
When the second light is reflected in the same direction as the first light transmitted through the first light source, the first light from the first array light source 21 and the second light from the second array light source 22 Since the two lights have the wavelengths that are farthest from each other, they are formed between the first transparent member 24A and the second transparent member 24B, so that only the characteristics shown in FIG. 10 can be obtained. Even if the first wavelength-selective optical member 24d is used, sufficient transmission and reflection characteristics can be obtained even if the polarization planes of the first light and the second light are not uniform.

The second wavelength-selective optical member 24e
Is formed at the interface of the second transparent member 24B with the air and is not sandwiched between the transmission members, so that it can be configured to obtain sufficient reflection / transmission characteristics.

FIG. 5 shows a state in which G light from the third array light source 23 is not reflected by the glass as described above, and R light from the first array light source and the second array light source 22 are reflected. FIG. 9 is a characteristic diagram showing a light transmittance characteristic of a second wavelength-selective optical member 24e (light-selective film) configured to transmit light of B from FIG.

Here, the same characteristic is exhibited regardless of whether the polarization plane is an S-wave or a P-wave, and the average value AV is similarly reflected near 520 nm to 600 nm, and transmitted otherwise. As a result, the first and second lights are transmitted through the third and third lights as well as the light in which the polarization planes of the lights are not aligned and the P wave and the S wave intersect with each other. Even when light is reflected, sufficient transmission and reflection characteristics can be obtained.

For the above reasons, light from a plurality of light emitting element arrays can be mixed without attenuating to form a line of emitted light. Therefore, since the light beams from the respective array light sources are combined into one and exposed as one line, it is possible to perform light mixing by the prism without loss of light amount.

[0060]

As described above in detail with the embodiments, according to the invention described in this specification, the following effects can be obtained.

(1) According to the first aspect of the present invention, the first light from the first light emitting element row and the second light from the second light emitting element row are arranged.
Is the light with the largest wavelength among the three lights, so that the first wavelength-selective optical member formed between the first transparent member and the second transparent member, The first light is transmitted toward the second transparent member and the second light is transmitted in the same direction as the first light transmitted through the first wavelength-selective optical member.
When the first light and the second light are reflected, sufficient transmission and reflection characteristics can be obtained even if the polarization planes of the first light and the second light are not aligned.

The second wavelength-selective optical member comprises a second wavelength-selective optical member.
Is formed at the interface between the transparent member and the air, and is not sandwiched between the transmitting members. Therefore, it is possible to obtain sufficient reflection and transmission characteristics, and it is possible to configure the first light and the second light.
In the case where the third light is reflected while the third light is transmitted, sufficient transmission and reflection characteristics can be obtained even if the polarization planes of the light are not uniform.

That is, the light from the plurality of light emitting element arrays can be mixed without attenuating to form a linear output light. Therefore, the light beams from each array light source are combined into one and exposed as one line, so that the light is mixed by the prism without loss of light amount, the configuration of the drive circuit and the timing control are simplified, and the transport speed is improved. Even if unevenness occurs, even if movement in the direction perpendicular to the transport direction in the transport surface occurs, color shift does not occur,
An image exposure apparatus with a simple mechanism for maintaining the transport surface can be realized.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a configuration of a main part of an image exposure apparatus according to an embodiment of the present invention.

FIG. 2 is a side view showing the overall configuration of the image exposure apparatus according to the embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a specific configuration of a dichroic prism which is a main part of the image exposure apparatus according to the embodiment of the present invention.

FIG. 4 is a functional block diagram illustrating an overall electrical configuration of the image exposure apparatus according to the embodiment of the present invention.

FIG. 5 is a characteristic diagram showing characteristics of a second wavelength-selective optical member of the present invention.

FIG. 6 is an explanatory diagram showing a state of image formation by a conventional image exposure apparatus.

FIG. 7 is an explanatory diagram for describing a configuration of a light source for obtaining linear emitted light having a desired density.

FIG. 8 is an explanatory diagram showing a state of image formation by a conventional image exposure apparatus.

FIG. 9 is an explanatory diagram showing how light is mixed by a dichroic prism.

FIG. 10 is a characteristic diagram showing optical characteristics of a wavelength-selective optical member formed between transparent members.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Printing paper 12a, 12b Drive roller 13 Cutter 21-23 Array light source 24 Dichroic prism 24A First transparent member 24B Second transparent member 24a, 24b Incident end 24d First wavelength selective optical member 24e Second wavelength selection Optics member 25 cell hook lens array 24 dichroic prism 30 CPU 31-33 HDC circuit 41-43 HD circuit 50 photographic paper transport mechanism

Claims (3)

[Claims] An image exposure apparatus for exposing an image to a photosensitive material using light from a plurality of light emitting element arrays, wherein light of different wavelengths emitted from first to third light emitting element arrays is mixed. A light mixing means for forming a linear emission light mixed on the same line; and an exposure line having a component perpendicular to the exposure line formed by exposing the linear emission light to the photosensitive material. Moving means for moving at least one of the photosensitive material and the light mixing means so as to move, the first light from the first light emitting element row and the second light from the second light emitting element row. The second light is a light having the largest wavelength among the three lights, and the light mixing means includes a first transparent member, a second transparent member, the first transparent member, and the second transparent member. It is formed sandwiched between members and is selective according to the wavelength of light A first wavelength-selective optical member that transmits or reflects, and a second wavelength-selective optical member that is formed at the interface of the second transparent member with air and that selectively transmits or reflects according to the wavelength of light. , The first light emitted from the first light emitting element array is received by the first transparent member, and the second light emitted from the second light emitting element array is received by the second transparent member. And the first light is transmitted by the first wavelength-selective optical member to the side of the second transparent member, and the first light is transmitted by the first wavelength-selective optical member. The second light is reflected in the same direction as the first light and the second light is transmitted and emitted by a second wavelength-selective optical member, and the first light to be emitted is emitted. Reflecting the third light in the same direction as the light and the second light. Image exposure apparatus according to symptoms. 2. An image exposure apparatus according to claim 1, wherein said light mixing means is a prism having optical characteristics dependent on the wavelength of light. 3. The light mixing means according to claim 1, wherein the light mixing means is a prism provided with a light selection film for causing transmission and reflection depending on the wavelength of light as a wavelength selective optical member. Image exposure equipment.