HK1146845A - An eyeglass-type image display device and an eyeglass frame used therefor - Google Patents

Description

Eyeglass type image display device and eyeglass frame used for the same

Cross Reference to Related Applications

The present application claims priority from japanese application No.2009-074809, filed 3/25/2009, the content of which is incorporated herein by reference.

Technical Field

The present invention relates to a glasses-type image display device and a glasses frame used for the glasses-type image display device.

Background

As disclosed in JP2008-67285A, for example, there is known a glasses-type image display device including, for example: a main body unit fixed to temples of the glasses frame; and an image display unit movable to a standby position adjacent to the main body unit and a use position directly in front of the eyeglass lenses, the eyeglass-type image display device causing the main body unit to automatically move the image display unit to the standby position and the use position.

However, with the aforementioned image display device disclosed by JP2008-67285A, in order to automatically move the image display unit to the standby position and the use position, the main body unit has a built-in driving mechanism (such as a motor and a worm wheel), and a guide rail or the like that extends from the main body unit and guides the movement of the image display unit is provided.

With this, there is a problem that the scale of the apparatus becomes large, resulting in an increase in cost. In addition, in the case where the image display unit is located at the standby position, there is also a problem that the user feels the image display unit, the guide rail, and the like to be eye-catching, and the main body unit, the image display unit, and the like protrude significantly from the eyeglass frame when viewed from a third person, which may impair the aesthetic appearance as a pair of eyeglasses. Further, when the user wears the pair of eyeglasses, the increased weight increases the load applied to his/her nose and ears, making it difficult for the user to wear the pair of eyeglasses for a long period of time.

Disclosure of Invention

Therefore, in view of the foregoing problems, it is an object of the present invention to provide a glasses-type image display device and a glasses frame used for the same, which can be easily constructed and reduce costs, and further, which is compact and lightweight without impairing the appearance and aesthetic appearance as a pair of glasses, and which can be safely worn by a user for a long period of time without feeling that the device is heavy.

A first aspect of the present invention to achieve the foregoing object is a glasses-type image display device including: a display element for displaying an image; and a light guide unit for guiding image light of the image displayed on the display element, wherein at least the light guide unit is disposed on a limb (limb) unit of the eyeglass frame to be displaceable to a first position where the light guide unit is evacuated from a front face of an eyeball of the user and a second position where the light guide unit is extended to the front face of the eyeball so that the image light is directed to the eyeball through the light guide unit, in a state where the user wears the eyeglass frame.

A second aspect of the present invention resides in the glasses-type image display device according to the first aspect, wherein the light guide unit has a shape that forms a part of an outer shape of the branch unit when located at the first position.

A third aspect of the present invention resides in the glasses-type image display device according to the first aspect, wherein the light guide unit is provided on the branching unit so as to be rotatable to the first position and the second position.

A fourth aspect of the present invention resides in the glasses-type image display device according to the first aspect, wherein the light guide unit is provided on the branching unit to be slidable to the first position and the second position.

A fifth aspect of the present invention resides in the eyeglass-type image display device according to the first aspect, wherein the display element is separated from the light guide unit, and the display element is disposed on the eyeglass frame so as to be opposed to an image light incident end of the light guide unit in a state where the light guide unit is located at the second position.

A sixth aspect of the present invention resides in the eyeglass-type image display device according to the first aspect, wherein the display element is provided on an image light incident end of the light guide unit so as to be integral with and movable together with the light guide unit.

A seventh aspect of the present invention is the eyeglass-type image display device according to the first aspect, wherein, in the second position, a width of a projection cross section of the light guide unit in the visual axis direction of the user is equal to or less than 4mm, the width being less than a pupil diameter of the eyeball.

An eighth aspect of the present invention resides in the glasses-type image display device according to the first aspect, wherein the light guide unit is configured such that: in a state where the light guide unit is located at the second position, the image light from the display element passes outside the eyeglass lens and enters the light guide unit, and the image light emitted from the light guide unit is transmitted through the eyeglass lens and incident on the eyeball.

Further, a ninth aspect of the present invention to achieve the foregoing object is a glasses frame for a glasses-type image display device according to the fifth aspect, the glasses frame comprising:

a light guide unit mounting unit for displaceably mounting the light guide unit to the first position and the second position;

a notch portion formed in the branching unit such that the light guide unit is located at the branching unit when in the first position; and

a display element loading unit for loading the display element.

Further, a tenth aspect of the present invention to achieve the foregoing object is a glasses frame for a glasses-type image display device according to the sixth aspect, the glasses frame comprising:

a light guide unit mounting unit for mounting the light guide unit integrally provided with the display element so that the light guide unit is displaceable to the first position and the second position;

a notch portion formed in the branching unit such that the light guide unit is located at the branching unit when in the first position;

according to the eyeglass-type image display device according to the present invention, the light guide unit that guides the image light from the display element is provided on the branch unit of the eyeglass frame so as to be displaceable to the first position where the light guide unit is evacuated from the front of the eyeball and the second position where the light guide unit extends to the front of the eyeball so that the image light can be directed to the eyeball through the light guide unit, thereby making the structure simple, compact and lightweight, which can reduce the cost without impairing the aesthetic appearance as a pair of eyeglasses, and also making it easy for the user to wear the pair of eyeglasses for a long period of time without feeling that the pair of eyeglasses is heavy.

Further, according to the eyeglass frame according to the present invention, it is possible to provide an eyeglass frame that can constitute a eyeglass type image display device that easily produces the above-described action and effect.

Drawings

Fig. 1 is a front view and a side view showing a non-image observation state of a glasses type image display apparatus according to a first embodiment of the present invention;

fig. 2 is a front view and a side view illustrating an image observable state of the glasses type image display apparatus shown in fig. 1;

fig. 3 is a partial schematic view of the glasses type image display apparatus shown in fig. 1;

fig. 4 is a front view and a side view showing a non-image observation state of a glasses type image display apparatus according to a second embodiment of the present invention;

fig. 5 is a front view and a side view illustrating an image observable state of the glasses type image display apparatus shown in fig. 4;

fig. 6 is a partial schematic view of the glasses type image display apparatus shown in fig. 4;

fig. 7 is a front view and a side view showing a non-image observation state of a glasses type image display apparatus according to a third embodiment of the present invention;

fig. 8 is a front view and a side view illustrating an image observable state of the glasses type image display apparatus shown in fig. 7;

fig. 9 is a partial schematic view of the glasses-type image display apparatus shown in fig. 7;

fig. 10 is a front view and a side view showing a non-image observation state of a glasses type image display apparatus according to a fourth embodiment of the present invention;

fig. 11 is a front view and a side view illustrating an image observable state of the glasses-type image display apparatus shown in fig. 10;

fig. 12 is a front view and a side view showing a non-image observation state of a glasses type image display apparatus according to a fifth embodiment of the present invention;

fig. 13 is a front view and a side view illustrating an image observable state of the glasses-type image display apparatus shown in fig. 12;

fig. 14 is a partial front view showing a schematic view of an eyeglass frame according to a sixth embodiment of the present invention;

fig. 15 is a partial front view showing a schematic view of an eyeglass frame according to a seventh embodiment of the present invention.

Detailed Description

Embodiments of the present invention are described below with reference to the drawings.

(first embodiment)

Fig. 1 to 3 illustrate schematic views of a glasses-type image display device according to a first embodiment of the present invention. Fig. 1A and 1B are a front view and a side view showing a non-image observation state in which image observation is not performed, fig. 2A and 2B are a front view and a side view showing an image observation state in which image observation can be performed, and fig. 3A to 3C are partial schematic diagrams.

The eyeglass type image display device according to the present embodiment is of a right eye type and has a light guide unit 11, the light guide unit 11 being provided on a branching unit 3 for the right eye, the branching unit 3 holding a lens 2 for the right eye of a spectacle frame 1. The light guide unit 11 is composed of plastic, glass, or the like, and one end of the light guide unit 11 is rotatably held by a central portion of the outer lateral side of the branching unit 3 by a holding member 12 so that the light guide unit 11 is selectively extended to a notch portion 4, the notch portion 4 being formed from the central portion of the lower side of the branching unit 3 up to a part of the outer lateral side of the branching unit 3. Therefore, in a state where the user wears the eyeglass frame 1, the light guide unit 11 is configured such that the light guide unit 11 can be manually rotated to be positioned at a first position in a non-image-observable state where the light guide unit 11 is evacuated from the front of the right eyeball 13 of the user and extended to the notch section 4 as shown in fig. 1A and 1B, and at a second position in an image-observable state where the light guide unit 11 is away from the notch section 4 and extended to the front of the right eyeball 13 as shown in fig. 2A and 2B.

Therefore, the holding member 12 is provided with, for example, rotating shafts (not shown) protruding from both sides of the holding member 12 in the interpupillary distance direction. In addition, a bearing unit 3a (see fig. 3B) is formed in the branching unit 3, the bearing unit 3a rotatably supporting the rotating shaft of the holding member 12 and selectively performing positioning at the first position and the second position. It should be noted that the lens 2 may be constituted by a lens having diopter or only a transparent member having no diopter in accordance with the vision of the right eyeball 13 of the user.

Further, the light guide unit 11 has a shape forming a part of the outer shape of the branching unit 3. In the present embodiment, the branching unit 3 has a substantially square appearance configuration. Therefore, the light guide unit 11 has a substantially "L" shaped external configuration, and is configured such that light is incident on an incident surface 11a at one end of the light guide unit 11, is reflected by reflective surfaces 11b and 11c in order within the light guide unit 11, exits in a direction almost opposite to the incident direction through an eyepiece lens 11d provided on the other end of the light guide unit 11, and is guided to the eyeball.

In addition, as for the light guiding unit 11, it should be noted that, in a state where the light guiding unit 11 is located at the second position, a projected cross-sectional width of the light guiding unit 11 in the user's visual axis direction is equal to or less than 4mm, 4mm being a diameter of a human pupil in a normal environment, and a portion of the light guiding unit 11 extending to the front of the eyeball of the user is formed in a tapered shape whose width becomes narrower from one end of the portion to the other end thereof. In this case, the width of the entire tapered portion is less than 4 mm. Further, when the light guiding unit 11 is located at the second position, the light guiding unit 11 has a length that does not reach the visual axis of his/her right eyeball 13 when the user focuses to infinity.

On the other hand, as shown in fig. 3A and 3B, the end piece 6 connecting the branch unit 3 and the right temple 5 has a built-in image display unit 14. The image display unit 14 is provided with a display element 15 composed of an LCD or an organic EL. The display element 15 is opposed to the incident surface 11a of the light guide unit 11 in a state where the light guide unit 11 is located at the second position as shown in fig. 2A and 2B, and a protection window 16 is provided on the image display surface side of the display element 15.

Thus, as shown in fig. 3C, in a state where the light guide unit 11 is located at the second position, the image light of the image displayed on the display element 15 is incident on the incident surface 11a of the light guide unit 11 from the outside of the lens 2 through the protection window 16, passes through the reflective surfaces 11b, 11C of the light guide unit 11 and the eyepiece lens 11d, and passes through the lens 2 to be emitted from the light guide unit 11 to the right eyeball 13. Therefore, the user can observe an enlarged virtual image of the image displayed on the display element 15 by directing the gaze of his/her right eyeball 13 toward the eyepiece lens 11 d.

As described above, in the present embodiment, the light guiding unit 11 is rotatably provided on the branching unit 3, the display unit 14 is fitted into the end piece 6, and the light guiding unit 11 is manually rotated so as to be switched between the non-image observation state shown in fig. 1A and 1B and the image observation state shown in fig. 2A and 2B. In addition, in the non-image-observation state in which the light guide unit 11 is located at the first position, the light guide unit 11 forms the outer shape of the branch unit 3, and in the image-observation state in which the light guide unit 11 is located at the second position, the user can observe an enlarged virtual image of the image displayed on the display element 15 by directing his/her eye of the right eyeball 13 toward the eyepiece lens 11 d. Therefore, the structure can be simplified, made compact, and made lightweight, thereby enabling cost reduction and enabling a user to easily wear a pair of glasses for a long period of time without feeling that the pair of glasses is heavy.

Further, the light guide unit 11 constitutes the outer shape of the branching unit 3 when located at the first position in the non-image observation state, thereby preventing the user from feeling the light guide unit 11 eyeward and also preventing the appearance and aesthetic appearance of the eyeglass frame 1 from being impaired. Further, with the light guiding unit 11, the projected cross-sectional width in the user's visual axis direction when located at the second position in the image observable state is equal to or less than 4mm (the width is smaller than the pupil diameter in the normal environment), so that the visual field is not substantially obstructed. So that the user can see through the light guide unit 11. In addition, the light guide unit 11 is formed to be tapered toward the pupil side. Thus, since the light guiding edge can be made narrower, a brighter field of view can be obtained, and also the see-through effect can be improved. Further, even if the second position of the light guide unit 11 is slightly shifted to cause the optical axes of the right eyeball 13 and the eyepiece lens 11d to be misaligned, vignetting is less likely to be generated by the opening of the incident portion because the incident end of the light guide unit 11 is thick.

Further, in the state where the light guide unit 11 is located at the second position, the image light from the display element 15 is incident on the incident surface 11a of the light guide unit 11 from the outside of the lens 2 (i.e., the image light is not transmitted through the lens 2), thereby preventing the quality of the display image from being degraded depending on the type of the lens 2. Further, the image light guided by the light guide unit 11 and emitted through the eyepiece lens 11d is transmitted through the lens 2 and incident on the right eyeball 13, thereby enabling the user to observe the image with the eyesight corrected by the lens 2. And thus the diopter adjustment structure can be omitted.

(second embodiment)

Fig. 4 to 6 illustrate schematic views of a glasses-type image display device according to a second embodiment of the present invention. Fig. 4A and 4B show a front view and a side view of a non-image-observable state, respectively, fig. 5A and 5B show a front view and a side view of an image-observable state, respectively, and fig. 6A and 6B show partial schematic views corresponding to fig. 3A and 3B.

In the glasses-type image display device according to the present embodiment, with respect to the first embodiment, the notch portion 4 is formed from the central portion of the upper portion of the branching unit 3 up to a part of the outer lateral side of the branching unit 3, and the light guide unit 11 is rotatably held to the branching unit 3 so that the light guide unit 11 is selectively extended to the notch portion 4. Since the other structures are the same as those of the first embodiment, the same reference numerals denote the same parts and the description of the same parts is omitted.

Therefore, in the present embodiment, the same operation and effect as those of the first embodiment can be produced as well. Specifically, in the case of the present embodiment, the light guide unit 11 is rotated from the upper position of the branching unit 3 to the vicinity of the central portion of the lens 12 to move from the first position shown in fig. 4A and 4B to the second position shown in fig. 5A and 5B. Therefore, in the second position, the bottom surface of the holding member 12 of the light guide unit 11 (the surface that reaches the front surface of the first position) can abut to the recess surface 3C of the branching unit 3, thereby controlling the downward rotation. The positioning of the second position can thus be carried out more easily and stably.

(third embodiment)

Fig. 7 to 9 illustrate schematic views of a glasses-type image display device according to a third embodiment of the present invention. Fig. 7A and 7B show a front view and a side view of a non-image-observable state, respectively, fig. 8A and 8B show a front view and a side view of an image-observable state, respectively, and fig. 9A and 9B show a partial schematic view.

In the glasses-type image display device according to the present embodiment, the external shape of the branching unit 3 is curved as compared with the first embodiment. Thus, in the present embodiment, the external shape of the light guiding unit 11 is formed in a curved form in conformity with the external shape of the branching unit 3 so that the light guiding unit 11 forms a part of the external shape of the branching unit 3 in the non-image-observation state where the light guiding unit 11 is located at the first position. Such a curved light guide unit 11 may be constituted by a known free-form surface prism (e.g., JP3676472B2), for example. In this case, since the light guide unit 11 functions as a lens, the eyepiece lens 11d shown in fig. 1 is not necessary.

As for the light guiding unit 11, the incident end thereof is rotatably projected outward in a cantilever manner from the branching unit 3. That is, at the incident end of the light guide unit 11, the rotation shaft is provided directly on the face on the lens 2 side in a protruding manner. The rotating shaft is then rotatably received by a bearing 3a formed in the branching unit 3, which allows positioning in the first position and the second position.

In addition, in a state where the image display unit 14 is held by the end piece 6 and the light guide unit 11 is located at the second position shown in fig. 8A and 8B, the image light of the image displayed on the display element 15 passes through the protection window 16 and enters into the light guide unit 11 through the incident surface 11 a. Further, fig. 9A and 9B show a partial schematic front view and a side view, respectively, in a state where the light guide unit 11 is removed. Since the other structures are the same as those of the first embodiment, the same reference numerals denote the same parts and the description of the same parts is omitted.

Therefore, in the present embodiment, the same operation and effect as those of the first embodiment can be produced as well. It should be noted that in the present embodiment, the light guiding unit 11 may be rotatably provided on the upper portion of the branching unit 3 as in the case of the second embodiment to obtain the same effects as described in the second embodiment.

(fourth embodiment)

Fig. 10 to 11 show schematic views of a glasses-type image display device according to a fourth embodiment of the present invention. Fig. 10A and 10B show a front view and a side view of a non-image-observable state, respectively, and fig. 11A and 11B show a front view and a side view of an image-observable state, respectively.

In the glasses-type image display device according to the present embodiment, the light guide unit 11 is provided on the branching unit 3 such that the light guide unit 11 is manually slidable to a first position in the non-image observable state shown in fig. 10A and 10B and a second position in the image observable state shown in fig. 11A and 11B. Thus, a slide rail 17 is slidably provided on the upper portion of the branching unit 3, and the slide rail 17 is supported by the light guiding unit 11.

In the non-image-viewing state in which the light guide unit 11 is located at the first position, the slide rail 17 is exposed along the outer periphery of the lens 2 at the notch portion 4 of the branching unit 3. Therefore, in the image observable state where the light guide unit 11 is located at the second position, the slide rail 17 is slid to the upper portion of the branching unit 3 and accommodated therein without being exposed.

The light guide unit 11 is configured by, for example, using a prism having a plane reflection surface inside and a free-form surface prism as described in the third embodiment, and the light guide unit 11 has a shape that forms a part of the outer shape of the branching unit 3 in the non-image observation state where the light guide unit 11 is located at the first position.

In addition, the image display unit 14 is embedded in the end piece 6 and is configured such that: in a state where the light guide unit 1 is located at the second position, the image light of the image displayed on the display element 15 enters the light guide unit 11 through the protection window 16 and is directed toward the right eyeball 13 of the user. The other structure is the same as that in the foregoing first or third embodiment.

Therefore, in the present embodiment, the same operation and effect as those of the first and third embodiments can be produced as well. It should be noted that the slide rail 17 may be slidably provided so that the slide rail 17 may be accommodated in the upper portion of the branching unit 3, and further, the slide rail 17 may extend from the upper portion of the branching unit 3 up to the lower portion of the branching unit 3 and be fixedly provided, and the light guide unit 11 is slidably supported with respect to the slide rail 17 so as to be able to be selectively positioned to the first position and the second position. Further, the light guide unit 11 may be slidably disposed at an upper portion of the branching unit 3. In this case, the incident end of the light guide unit 11 can be made to abut against the end piece 6 at the second position by utilizing the weight of the light guide unit 11, thereby facilitating positioning at the second position.

(fifth embodiment)

Fig. 12 to 13 show schematic views of a glasses type image display device according to a fifth embodiment of the present invention. Fig. 12A and 12B show a front view and a side view of a non-image-observable state, respectively, and fig. 13A and 13B show a front view and a side view of an image-observable state, respectively.

In the glasses-type image display device according to the present embodiment, in the first embodiment, the display element 15 is held to the holding member 12 such that the display element 15 is opposed to the incident end of the light guide unit 11, thereby allowing the display element 15 to rotate integrally with the light guide unit 11. Since the other structures are the same as those of the first embodiment, the same reference numerals denote the same parts and the description of the same parts is omitted.

Therefore, in the present embodiment, the same operation and effect as those of the first embodiment can be produced. Specifically, in the present embodiment, the display element 15 is provided on the light guide unit 11 side to allow the display element 15 to rotate integrally with the light guide unit 11, so that the structure can be made simpler and the assemblability can be improved as compared with the case where the display element 15 and the light guide unit 11 are separated. So that the cost can be reduced. Note that the structure in which the display element 15 is thus provided on the light guide unit 11 side can also be effectively applied to the second to fourth embodiments.

(sixth embodiment)

Fig. 14 is a partial front view showing a schematic view of an eyeglass frame according to a sixth embodiment of the present invention. The eyeglass frame 21 constitutes the eyeglass type image display device according to the first embodiment shown in fig. 1 to 3, and the eyeglass frame 21 includes: a light guide unit mounting unit 22, the light guide unit mounting unit 22 being configured to detachably mount the aforementioned light guide unit 11 at a first position and a second position; a notch portion 24 formed in the branching unit 23 to allow the light guide unit 11 to be positioned on the branching unit 23 at the aforementioned first position; and a display element loading unit 25, the display element loading unit 25 being for loading the image display unit 14 including the display element 15. The light guide unit mounting unit 22 is formed in the branching unit 23, and the display element loading unit 25 is formed in the end piece 26. It should be noted that other components of the eyeglass frame, such as temples, are not shown.

Therefore, by using the eyeglass frame 21, as shown in fig. 1 to 3, the lens 2 is mounted on the branching unit 23, the light guide unit 11 is mounted on the light guide unit mounting unit 22 so as to be rotatable to the first position and the second position by the holding member 12, and the combined image display unit 14 having the display element 15 and the protection window 16 is loaded on the display element loading unit 25. The glasses type image display apparatus can be easily constructed.

(seventh embodiment)

Fig. 15 is a partial front view showing a schematic view of an eyeglass frame according to a seventh embodiment of the present invention. The eyeglass frame 31 constitutes the eyeglass type image display device according to the fifth embodiment shown in fig. 12 and 13, and the eyeglass frame 31 includes: a light guide unit mounting unit 32, the light guide unit mounting unit 32 being used for mounting the aforementioned light guide unit 11 so as to be displaceable to a first position and a second position; and a notch portion 34, the notch portion 34 being formed in the branching unit 33 to allow the light guide unit 11 to be positioned on the branching unit 33 at the aforementioned first position. The light guide unit mounting unit 32 is formed in the branching unit 33. It should be noted that other components of the eyeglass frame, such as temples, are not shown.

Therefore, by using the eyeglass frame 31, as shown in fig. 12 and 13, the lens 2 is mounted on the branching unit 33, and the light guide unit 11 integrally held with the display element 15 by the holding member 12 is mounted on the light guide unit mounting unit 32 so as to be rotatable to the first position and the second position. And thus the glasses type image display apparatus can be easily constructed.

It should be noted that the present invention is not limited to the foregoing embodiments, and various variations and modifications may be performed. For example, in the glasses-type image display device according to the foregoing embodiment, the width of the projection cross section in the visual axis direction of the user is equal to or less than 4mm, which is smaller than the pupil diameter in the normal environment. However, only the light guiding end portion including the exit portion of the light guiding unit 11 may be made smaller than the pupil diameter to provide a see-through function. Further, the shape of the light guiding unit 11 is not limited to a tapered shape whose width narrows toward the exit end of the image light, but may be a uniform width from the entrance end side up to the entrance end side to let the image light from the display element 15 enter. Obviously, in this case, too, a see-through effect can be provided by making the width of the projection cross-section in the direction of the viewer's visual axis smaller than the pupil diameter in the second position.

In addition, the eyeglass frame according to the present invention is not limited to the structure shown in fig. 14 and 15, but may be configured as an eyeglass frame for constituting each eyeglass-type image display device according to the second to fourth embodiments.

Further, the present invention is not limited to the aforementioned right-eye type, but may be configured as a left-eye type. In addition, the present invention may be constituted by providing a light guide unit on each of the branch units on both eyes and providing the light guide units on the upper and lower sides of the branch unit on one side. The invention can also be constructed as a multi-screen.

Claims (10)

1. A glasses-type image display device comprising: a display element for displaying an image; and a light guide unit for guiding image light of the image displayed on the display element, wherein:

at least the light guide unit is disposed on the branching unit of the eyeglass frame so as to be displaceable to a first position where the light guide unit is evacuated from the front of one eyeball of the user and a second position where the light guide unit extends to the front of the eyeball so that the image light is directed to the eyeball through the light guide unit in a state where the user wears the eyeglass frame.

2. The glasses-type image display device according to claim 1, wherein:

the light guide unit has a shape forming a part of an outer shape of the branch unit when located at the first position.

3. The glasses-type image display device according to claim 1, wherein:

the light guide unit is provided on the branching unit to be rotatable to the first position and the second position.

4. The glasses-type image display device according to claim 1, wherein:

the light guide unit is provided on the branching unit to be slidable to the first position and the second position.

5. The glasses-type image display device according to claim 1, wherein:

the display element is separated from the light guide unit, and the display element is disposed on the eyeglass frame so as to be opposed to an image light incident end of the light guide unit in a state where the light guide unit is located at the second position.

6. The glasses-type image display device according to claim 1, wherein:

the display element is disposed on an image light incident end of the light guide unit so as to be integral with and movable together with the light guide unit.

7. The glasses-type image display device according to claim 1, wherein:

when the light guide unit is at the second position, the width of the projection cross section of the light guide unit in the visual axis direction of the user is equal to or less than 4mm, and the width is less than the pupil diameter of the eyeball.

8. The glasses-type image display device according to claim 1, wherein:

the light guide unit is configured such that: in a state where the light guide unit is located at the second position, the image light from the display element passes outside the eyeglass lens and enters the light guide unit, and the image light emitted from the light guide unit is transmitted through the eyeglass lens and incident on the eyeball.

9. A glasses frame for a glasses-type image display device according to claim 5, comprising:

a light guide unit mounting unit for displaceably mounting the light guide unit to the first position and the second position;

a notch portion formed in a branching unit such that the light guide unit is located at the branching unit when in the first position; and

a display element loading unit for loading the display element.

10. A glasses frame for a glasses-type image display device according to claim 6, comprising:

a light guide unit mounting unit for mounting the light guide unit integrally provided with the display element so that the light guide unit is displaceable to the first position and the second position;

a notch portion formed in a branching unit such that the light guide unit is located at the branching unit when in the first position.