JPS58169111A - Mirror supporting device in optical system - Google Patents

Abstract

PURPOSE:To avert image blurring owing to the defective parallelism between the reflection surface and rear surface of a mirror in an optical system for an electronic copying machine, laser printer, a reading and writing device of a facsimile, etc. by supporting the reflection surface of the mirror at three points with three projections. CONSTITUTION:A mirror supporting device 1 has two mirror supporting members 3, 4 which are disposed apart from each other, and a connecting member 5 which connects both members to one body. The 1st and the 2nd projections 10, 11 are provided projectively in the supporting hole 6 formed to one member 3 adjacently to the respective end parts 8, 9 of the hole 6, and the front surface, that is, reflection surface 28, of a mirror 2 is in contact with the projections 10, 11. The 3rd projection 18 is provided projectively in the supporting hole 7 formed on the other member 4 roughly at the middle in the respective end parts 16, 17 thereof, and the reflection surface 28 of the mirror is in contact with the projection 18. The regions in the respective end parts of the mirror 2 are pressed by two leaf springs 13, 20, and the mirror is supported at the three points under press contact with the three projections 10, 11, 18. Since the mirror is positioned with the reflection surface as a basis in the above-mentioned way, the uneven blurring of the image owing to the deviation in the parallelism between the front and rear surfaces of the mirror or the blurring of the image owing to a change in the conjugate length is obviated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has a mirror support member that supports a mirror at three points with three protrusions. The present invention relates to a mirror support device in an optical system.

Electronic copying machine, laser printer, facsimile reading/
Mirror support devices of the above type used in optical systems such as writing devices are well known in the art. In this case, the mirror's reflective surface (surface)'! l- It is necessary to position the mirror in a predetermined correct position and to support the mirror on its support member. On the other hand, in the conventional mirror support device of this type, the mirror is supported by making the three projections described above, which serve as the reference for the support position of the mirror, come into contact with the rear surface of the mirror on the opposite side to the reflective surface of the mirror.

Therefore, the mirror is supported by the mirror support member with its back side as a reference. For this reason, unless the back surface of the mirror and the reflective surface are highly parallel, the reflective surface of the mirror cannot be placed in the correct position, which will degrade the imaging function of the optical system. So- There is a risk of it happening. However, it is not easy to form the reflective surface and the back surface of the mirror accurately parallel to each other, which increases the time it takes to process the mirror and requires a special processing process, which inevitably increases the cost of manufacturing the mirror. will rise. In addition, if the mirror is supported with its back side as a reference, when the mirror is damaged and the mirror is replaced with a new one, the difference between the new mirror and the old mirror due to variations in mirror thickness. If the thickness is different, the distance from the object plane to the image plane when using the old mirror and when using the new mirror.

In other words, the conjugate length changes, and the adjustment must be made over time.

The main object of the present invention is to provide a mirror support device that does not cause the above-mentioned disadvantages even if the parallelism between the reflective surface and the back surface of the mirror is somewhat poor or even if the thickness of the mirror varies. be.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to all the drawings.

FIG. 1 is a schematic perspective view showing a mirror support device l according to the present invention and a mirror 2 supported by it. The illustrated mirror support device 1 includes two mirror support members 3 and 4 arranged apart from each other, and a connecting member 5 that connects them together.In this example, the support members 3 and 4 are flat plates. It is composed of plate pieces in the shape of n. C to each support member 3.4,
Support holes 6 and 7 for supporting the mirror 2 are drilled therein,
Each end region of the mirror 2 fits into these holes 6.7.

As clearly shown in FIG. each end 8,
Two first and second protrusions 10.11 are provided protrudingly adjacent to the mirror 20, and the surface of the mirror 20, that is, the reflective surface 28, is in contact with these protrusions 10.11.

A first plate spring 13 is press-fitted between the back surface 29 of the mirror 2 and the wall surface 12 of the first hole 6, and the two protrusions 1 of the spring
4% 15 is in pressure contact with the mirror back surface 29. On the other hand.

The other mirror support member 4 (hereinafter, the second mirror support member 4 as needed)
As can be seen from FIG.
A third protrusion 18 is protruded approximately midway between each of the ends 16 and 17, and a mirror reflecting surface 28 abuts on this protrusion 18. Also in this case, the mirror back surface 29 and the wall surface 19 of the second hole 7
The protrusion 21 of the second leaf spring 20, which is press-fitted between the mirror surface 29 and the mirror surface 29, is in pressure contact with the mirror rear surface 29.

The mirror 2 thus has two plates 13 at each end region.
．． 20 suppressed A, 3 (7) protrusions 10.11.1
8 and supported at three points.

Mirror support device 1 and mirror 2 as described above.

It is used by being placed in the imaging optical system of various optical instruments.

At that time, the light from the object plane (not shown) is.

For example, as shown by the arrow, it enters the reflective surface 28 of the mirror 2,
The light is reflected here and reaches an imaging plane (not shown).

At a suitable location in the optical path from the object plane to the image plane.

An imaging lens is arranged, and in FIG. 1, as an example, a lens 22 located between the mirror 2 and the object plane is schematically shown by a chain line. In this case, in order to form an unblurred image on the imaging plane, it is necessary not only to arrange the object plane and the imaging plane at right angles optically to the optical axis The longitudinal direction Y and the optical axis X are arranged at right angles, and the mirror reflection surface 28 and the optical axis
Figure) It is necessary to set the mirror at a predetermined correct angle over its entire length. In the illustrated configuration, in order to satisfy this requirement, the mirror 2 is supported at three points by three protrusions 10, 11, and 18 arranged at predetermined positions, and one plane defined by the tips of these three points is provided. A mirror is positioned above. The two supporting members 3 and 4 are firmly fixed to the connecting member 5 to improve the positional accuracy of the three protrusions 10, 11, and 18, and the rigidity of the mirror support device is strengthened so that the positional accuracy of the mirror is not affected by deflection of the mirror. This prevents it from happening.

As mentioned above, it is important for this type of device to position the reflective surface 28 of the mirror 20 at a predetermined position. The mirror was supported by a mirror support device by making contact with three protrusions that serve as positioning references for the mirror.

For this reason, even if the manufacturing precision of the mirror support device is increased,
Even if the rigidity is maintained high, if the parallelism between the reflecting surface and the back surface of the mirror is even slightly poor, it is impossible to avoid the drawback that blurring of the image on the imaging plane cannot be prevented. However, in the illustrated mirror support device 1, the three protrusions 10, 11, and 18 that serve as mirror positioning references are in contact with the reflective surface side of the mirror, so the mirror 2 is supported with the reflective surface 28 side as a reference. attached to the device l. Therefore, even if the parallelism between the reflective surface and the back surface of the mirror is somewhat poor, or even if the thickness of the old and new mirror is different when replacing the mirror, the mirror will still be positioned based on the reflective surface. Therefore, problems such as partial blurring of the image due to a deviation in parallelism between the front and back surfaces of the mirror or blurring of the image due to a change in the conjugate length do not occur.

1 car mirror support member 3. Since the 4ta contacts each end region of the mirror 2 and supports it, there is no problem such as the progress of the light incident on the mirror 2 and reflected there being obstructed by the mirror support member 3.4. Of course, the mirror support members 3 and 4 shown in Figure 1 are formed in a flat plate shape.
Since its thickness is extremely thin, it is possible to increase the ratio of the portion of the mirror that can be effectively used without inhibiting the progress of light.

By the way, if the mirror 2 supported by the support member 3.4 is pressed against the support member 3.41C with too strong force, the mirror will bend due to this pressing force itself.

This may deteriorate the imaging function of the optical system. For this purpose, the plate springs 13 and 20 mentioned above are provided to elastically press the mirror 2 and prevent a strong force that would cause the mirror to bend from being applied to the mirror. In this case.

A leaf spring 13 that abuts against the back surface 29 of the mirror 2. ．． Each projection 14.15.21 of 20 corresponds to each projection 10,
It faces 11°18. More specifically, two projections 10.11 face two spring projections 14.15, and one projection 18 faces one spring projection 21. For this reason, the spring 13 ; 20 and the protrusion In, 1
1; 18, the force exerted on the z5 mirror 2 causes no bending moment to act on the mirror 2;
Therefore, it is possible to prevent the inconvenience of the mirror being bent and the imaging function of the optical system being degraded.

Also, to prevent the leaf springs 13, 20 press-fitted into the support holes 6, 7 from falling out of the holes 6, 7.

FIG. 3 (As shown in allb+, the wall surface 1 of the first hole 6
The recess 23VC of the first leaf spring 13 that contacts the notch 24
Similarly, in the second leaf spring 2o, a notch 25 is formed at each end that comes into contact with the wall surface 19 of the second hole 7. 617 wall surface 12
Locking protrusions 26 and 27 projecting at angles 19 and 27 are respectively engaged. A locking protrusion is provided on the plate spring 13.20,
It goes without saying that each support hole may be provided with a notch and these may be engaged with each other. In addition, the member that elastically presses the mirror is not limited to a leaf spring, and other elastic members such as rubber can also be used. In this case, this elastic member is also engaged with the wall surface 12.19VC of the support hole 6.7. It is also clear that it is possible to prevent it from falling off.

By the way, in the embodiment shown in FIG. 2, each end 8 of the first hole 61C of the first support plate 3, as also shown in FIG.
Two protrusions 10.11 were provided adjacent to &9,
As shown in FIG. 4, the first and second protrusions 10. Il'i
The ends 8 and 9 of the hole 6 may be arranged at positions separated from each other.

However, as shown in Figure 4 aiC, each protrusion 10. ll'i
When placed, the distance L1 between them can be made longer than the distance L2 of the same protrusions shown in FIG. You can get the benefits that you can. Not only % each protrusion 10 located on the left and right of FIG. 4a. IIGI,) - height hlm h
2Vc manufacturing error VC, K tsu”C.

Even if a slight difference occurs, the accuracy of mounting the mirror 2 caused by the difference in the distances, lengths, heights hl and h2 can be kept to a low level.

Alternatively, it is possible to completely prevent the mirror mounting accuracy from decreasing to the extent that it affects the imaging function.

It is possible to maintain high accuracy of the angle α between the optical axis of the lens and the reflective surface of the mirror (Fig. 2). However, as in the case of Fig. 4, when the distance L2 is short.

Even if there is a slight difference in the heights of the respective protrusions 10, 11, the mounting accuracy of the mirror 16 will not be affected relatively greatly. The other configurations in the 41st Db are the same as those in the first embodiment described above.

Note that the connecting member 5 shown in FIG. 1 is connected to both mirror supporting members 3.
This is because it connects 4 together.

Various types of connecting members other than the one shown can be used as long as they can achieve the same purpose. for example,
Rather than fixedly connecting the connecting members to each mirror support member, these may be integrally molded in advance, or a plurality of connecting members may be provided. Or when fixing the mirror support device immovably.

- It is also possible to omit the 1% separate connecting member by giving the substrate that fixedly supports both mirror supporting members the function of a connecting member.

The basic configuration example of the present invention has been described above.

Next, a more specific example of the configuration when the present invention is applied to an optical system in a multiplex copying machine will be described.

FIG. 5 is a partial cross-sectional view of an electronic copying machine, in which an optical unit 30 is provided at the top of the copying machine.
1-j is fixedly connected to the main body frame 31 of the copying machine. 32 is a cover of the copying machine. The optical unit 30 is
It has a casing 36 consisting of a substrate 33, side walls and contact glass 35, and an imaging optical system 37 is arranged within this casing. This optical system 37 is composed of a first mirror support device 1a, a second mirror support device 1b, a third mirror support device 1c, and various elements that will be described later. 〇 Figure 6 is a schematic perspective view showing some of the constituent members shown in Figure 5 and the first mirror support device 1a4 omitted, and Figure 7 is a schematic diagram of the first mirror support device 1a. FIG. 8 is an exploded partial view of FIG. 7. In FIGS. 5 and 6, the substrate 3 of the casing 36 in the optical unit is shown.
A lens support 3 supported on the lens 22a' is mounted on the lens 22a'.
8 is provided, and a guide rod 39 is provided parallel to the original axis X of this lens 22a. The guide rod 39 serves as a reference for the mounting position of the first and second mirror support devices 1a and 1b, and as described later,
a.

Each end of the rod 3a serves as a reference member that serves as a guide reference when the rod lb moves.

It is firmly fixedly supported by the side wall 34.

As shown in FIGS. 5, 7, and 8, the first mirror support device 1a is provided with a pair of support plates '3a, 4a made of flat plate-like pieces similar to those shown in FIG. The first connecting
and second connecting members 5a, 5a'. The support holes 6a, 7aK bored in each of the support plates 3a, 4a are the first
The respective end regions of the mirror 2a fit together, the mirror having three protrusions 10a in exactly the same manner as shown in FIGS. 1-3.
,, supported at three points by 11a%is a and a plate,
Three protrusions are in contact with the reflective surface 28a. In this case, the mirror support member 3 on the right side in FIGS. 7 and 8
a (also in this case, this support member will be referred to as a first support member if necessary), two protrusions 10a.

11a is provided, and the other support member 4a (also referred to as a second support member) is provided with one protrusion 18a. A main reflector @40 is fixedly supported by the first connecting member 5a, and a lamp 42 is detachably supported by two mounting members 41. 43c First and second support members 3a
, 4a is an auxiliary reflector, and 44 is a slide shoe fixed to the outer surface of the second support member 4a. It is slidably placed on a fixed guide rail 45. Furthermore, a slit-like gap 46 of a predetermined width is provided between the second connecting member 5a/ and the main reflecting mirror 400, so that both members 53' and 40 function as regulating means for regulating the width of the light beam. It has become. lamp 42
Above the cover 47 is shown as a chain line in FIGS. 5 and 7.
The cover 47 is fixed to the first connecting member 5a and prevents the lamp 42 from being separated from the lamp 42.

48 is the first mirror support device 1a (z guide rod 39
The guide member 48 shown in FIG.
A guide rod 39 is fitted into this pipe 51 via bearings 52 and 53'i. Notched tongue piece 5 protruding from main body 5o
A rope 55 is engaged with the guide member 4, and the guide member 48 is drivingly connected to a motor (not shown) via the rope 55'ff. The first connecting member 5a and the guide member main body 50
In other words, they are firmly and fixedly connected by a connecting plate 56.

The second mirror support device 1b also includes two flat mirror support members 3b, as shown in FIGS. 5 and 6.

4bi, which are firmly connected to each other by a pipe-shaped connecting member 5b. Each mirror support member 3b,
4b has two support holes 5b and 6b'.

7b, 7b' hole, hole 6b door
b; The respective end regions of the second mirror 2b and the third mirror 2b' are fitted into 6b/ and 7bl, and the mirrors 2b and 2b' are also in exactly the same manner as shown in FIGS. 1 to 3 [, 3 protrusions each tob, jib, 18b; 10b'
, ttb', tsb' and the plate springs shown in FIG.
% are in contact. Also in this case, like the first mirror support device 1a, two protrusions 10b, llb are provided in each support hole 6b, 6b' of the mirror support member 3b (first support member) on the right side in FIG.

10b', llb' are provided f''L, and 1 is provided in each support hole 7b, 7b/ of the other mirror support member 4b (second support member).
Two protrusions 1sb and tab' are provided. The reflective surfaces 28b and 28b' of the second and third mirrors are 90° apart from each other.
The two mirrors 2b and 12b' are arranged at an angle of , and constitute one tano mirror.

The slide shoe 57 is fixed to the outer surface of the second support member 4b, and the tip of the slide shoe 57 is slidably mounted on the guide rail 45, as in the case of the first mirror support device. . Further, the first support member 3b includes
A gutter-shaped guide member 59 is connected through a plug throat 58, and a guide rod 3975 is fitted to each end wall plate 60 of the guide member 59 through a plug throat 58. This guide member 59 is longer than the guide member 48 in the first mirror support device 1a.

A guide member 51 of the first mirror support device 1a is located between the end wall plates 60 (FIG. 5). A boo 1j61 is rotatably supported on the guide member 59, and the lifting boo 1361 is also drivingly connected to the motor (5) (not shown) via the rope 551. A reinforcing member 63 is fixed to the tongue portion 62 protruding from the guide member 59 and the single mirror support members 3b, 4b.

- The third mirror support device 1C also has two mirror support members 3c and 4ci, and the fourth mirror 2C has a support hole 6c drilled in each support member 3C14C.

7C, in the manner described in connection with FIGS. 1 to 3,
Supported. In this case, these mirror support members 3c
, 4c are fixedly supported by the substrate 33.

Therefore, special connecting members 5a, 5b, 5b' as in the first and second mirror support devices 1a, lb are not provided.

Next, the operation of the above-mentioned copying machine will be explained in detail.

When the copying machine is not in operation, the first and second mirror support devices 1
a, lb are stopped at the left end standby position shown by the solid line in FIG. When the operator places the original 64 on the contact glass 35 as shown in FIG. The rope 55 is driven by the operation of the motor described above, and the first and second mirror supporting devices 1a% ltl
;J, being guided by the guide rod 39 and guide members 48 and 59;

It moves in the directions indicated by arrows A and B, which are parallel to the optical axis XK.

At this time, the lamp 42 is turned on, and the light beam reflected by one reflection@40, 43 and the light beam directly from the lamp 42 illuminate the original 64. The width of the luminous flux reflected on the document surface is regulated by the distance between 46 and the first, second and third mirrors 2.
It is reflected at a, 2b, and 2b/ respectively.

It passes through a stationary lens 228k. This light beam is then reflected by a fixedly fixed fourth mirror 2CIC, and passes through a slit 65 formed in the substrate 33.

The light is focused on the surface of the photosensitive drum 66 supported by the main body frame 31. At this time, the drum 66 is rotating in a predetermined direction, and since its surface is charged in advance, a two-dimensional electrostatic latent image corresponding to the image of the document 6 is formed on the surface of the drum 66. After being formed, this latent image is developed and transferred to a transfer paper (not shown). At the end of the illumination scan, the first
And the second mirror support devices 1a, lb are returned to the chain, only the outline of which is shown in FIG.

The longitudinal direction of the first to third mirrors 2a, 2b, 2b/, 2C is perpendicular to the optical axis X of the lens 22a, that is, the axis of the guide rod 39 serving as a reference member, and the reflective surface thereof is
By arranging it at a predetermined angle with respect to the optical axis X, r,! l
l. An image without blur can be formed on the drum 66. In this case, the pair of mirror supporting members are firmly connected by a connecting member or a substrate to not only maintain the correct relative positional relationship between the mirror and the guide rod, but also to maintain the correct relative positional relationship between the mirror and the guide rod.
As explained in connection with FIGS. 3 to 3, the mirror is positioned based on the reflective surface of the mirror, and the mirror is elastically supported by the plate springs, and each abuts against the mirror. Since the plate bending portion (protrusion) and the three protrusions are opposed to each other, the reflective surface of the mirror can be placed at a predetermined position with high precision, and the first and second mirror support devices 1a
, Ib, the first to third mirrors "-2a,
2b, 21 (bending and causing image blurring) can be reduced.

By the way, the first and second mirror support devices 1a.

1b, its first support member 33% 3b.

That is, two protrusions are provided in the support holes 6a, 6b, 6b'vc of the mirror support member closer to the guide rod 39, which is the reference member, and the support holes 7a, 7b of the second support members 4a, 4b.

One protrusion was provided on 7b' to support the mirror.

The reason for this will be fully explained below.

When a mirror is supported at three points while being held down by an elastic member as described above, the part of the mirror supported at two points is pressed relatively strongly, and the side supported at one point is relatively free, that is, in the longitudinal direction of the mirror. It is in a state where it is easy to rotate around the entire axis. Therefore, the mounting accuracy of the mirror to the support member is generally [,2
The positional accuracy of the first to third mirrors shown in FIGS. 5 to 7 is determined by the positional accuracy of the point support side, and the positional accuracy of the first to third mirrors shown in FIGS.
protrusions 10a, lla of the first support members 3a, 3b close to;
10 b, 11 b, 10 b', Il b
Determined by the positional accuracy of '.

- 10,000, position the mirrors 2a and 2b at predetermined positions with respect to the optical axis XK, that is, with respect to the guide rod 39.

In addition, in order to prevent the mirror from being deflected during operation, as described above, the mirror support member is connected to the connecting member 5a;
b, 5b', complement i! Although it is fixed by the mirror material 63 and the connecting plate 56, as the copying machine is used for a long period of time, each member deforms little by little and the positional accuracy of the mirror may become inconsistent. Generally unavoidable. In this case, the degree of deviation in the positional accuracy of the mirror is determined by minute deformations of various members interposed between the mirror mounting reference position on the mirror support member and the guide rod 39, which is the reference member of the mirror support member. Determined by the total amount of space added. Therefore, it is advantageous to arrange the position of the mirror attachment reference on the mirror support member and the guide rod 39, which is the reference member, as close as possible to reduce the number of parts interposed between them. This is the first to third mirror 2.
a; This is the reason why 2b and 2b' are positioned one position with reference to the support holes of the first support members 3a and 3b near the guide rod 39. If two mirror supporting protrusions are provided on the second support members 4a and 4b, and the mirror mounting position reference is set on the second support members 4a and 4b, this support member 4a
The distance between the guide rod 39 and the guide rod 39 is relatively long, and the number of members interposed between them is also large, so even if only a small amount of deformation occurs in these members, the total deformation will be quite large. , the positional accuracy of the mirror will be relatively greatly affected by this.

Even when the mirror 2C is fixedly supported like the third mirror support device 1c, the first and second mirror support devices 1a, 1b
Just as in the case of , the reflective surface of the mirror is supported at two points by the mirror support member 3C closer to the guide rod 39,
By supporting the reflective surface of the mirror at one point using another mirror support member 4C, the same effect as described above can be obtained. In this way, all the mirrors 2a in the first to third mirror support devices 1a, Ib, 1c,
2b.

2b'Th zC4s By attaching the guide rod 39 or the side wall 34 extending parallel thereto as a reference and aligning the references, it is possible to prevent the position of each mirror from being deviated due to the accumulation of errors in each member during the manufacture or operation of the optical system. The occurrence of this can be suppressed.

In each of the embodiments described above with reference to FIGS. 1 to 8, the three protrusions of the mirror support member were configured to come into direct contact with the reflective surface of the mirror, but this is not necessarily the case. There is no need to configure it. For example, a part without a reflective function may be made on a part of the surface of the mirror and this part may be brought into contact with a protrusion on the mirror support member, or in some cases, a sheet, film, etc. It is also possible to attach the entire surface, or to a surface coated with paint or the like, and a protrusion can be brought into contact with the surface. Alternatively, an intervening object such as a spacer may be inserted between the surface of the mirror and the protrusion to bring the surface of the mirror and the protrusion into indirect contact. in short,
As can be understood from the gist of the present invention explained above, the protrusion 1 of the mirror support member may be brought into contact with the "front side" of the mirror.

In exactly the same way, when an elastic member such as a plate is provided on the back side of the mirror, the elastic member is brought into direct contact with the back surface of the mirror, so there is no problem and there is no need for interference such as sheets, films, paints, spacers, etc. It is also possible to make one elastic member indirectly contact the rear surface of the mirror via the mirror.

Of course it is possible.

Also, in the optical systems shown in FIGS. 5 to 8, the fourth
Although it is natural that the mirror support system shown in FIG. It can be said that it is advantageous.

As can be seen from the above description, the present invention can achieve its intended purpose with a simple configuration.

The present invention is not limited to optical systems in electronic copying machines.

It can be applied to complete mirror support of optical systems in various other devices. It is also clear that the present invention can be applied to devices in which the mirror support member is made of a member other than a plate-shaped piece.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of the present invention, Fig. 2 is a partial view of Fig. 1 showing the mirror with chain lines and the mounting state of the mirror, and Figs. The perspective view of FIGS. 4a and 4b showing the relationship between the support hole and the structure shown in FIG.
FIG. 5 is a partial cross-sectional view of the electronic copying machine. FIG. 6 is a perspective view of the copying machine with the contact glass etc. omitted, showing a state in which the second mirror support device has been moved slightly from its standby position. FIG. 7 is a perspective view showing details of the first mirror support device;
This figure is an exploded perspective view showing only a part of the constituent members shown in FIG. 7. 1, la, lb, lc--mirror support device; 2
% 2a, 2b, 2b', 2c
・' Mira -; 3.3a%3b, 3c, 4
, 4a, 4b, 4C...mirror support member; 6, 6a, 6b, 6b', 6C, 7, 7a, 7b
, 7b', 7C...support hole; +0.10a, 10b, 10b', 11. lla
, llb, llb', 18.18a, 18b. 18b'...Protrusion 12.19...Wall surface; 13.20...Plate plate; 29...Engraving of the back drawing (no change in J) 11111 112! l! Figure 13 Figure 4 (G) (a) 2 (b) (b) Procedural Amendment Form C) August 24, 1980 Commissioner of the Japan Patent Office Kazuo Wakasugi ■ Indication of the Case 1982 Patent H No. 52716 No. 2 Name of the invention Mirror support device 3 in an optical system, relationship to the case of the person making the correction Patent applicant address 1-3-6 Nakamagome, Ota-ku, Tokyo Name (67
4) Ricoh Co., Ltd. 4, Agent 105 Address Chugin 5th Pill 3, 1-9-9 Nishi-Shinbashi, Minato-ku, Tokyo
Floor @ (501) No. 4887 July 9, 1980 Shipping date July 27, 1980 6. Correction of the engraving drawing 7. Contents of the correction

Claims (5)

[Claims] (1) It has a mirror support member that supports the mirror at three points with three protrusions. In a mirror support device in an optical system. A mirror support device characterized in that the three projections are brought into contact with the front surface side of the mirror. (2) The mirror support device according to claim 1, wherein at least a region of the mirror support member that supports the mirror is formed in a flat plate shape. (3) It has a mirror support member that supports the mirror at three points with three protrusions. In a mirror support device in an optical system. The mirror support member vc is formed with a support hole into which each end region of the mirror fits, and the three protrusions are provided on the wall surface of the support hole, and the protrusions are brought into contact with the surface side of the mirror; The mirror support device is characterized in that an elastic member is compressed between the back surface of the mirror opposite to the surface of the mirror and the wall surface of the support hole, and the elastic member is locked to the wall surface of the support hole. (4) It has a mirror support member that supports the mirror at three points with three protrusions. At the mirror support part #Lvc in the optical system. A support hole into which each end region of the mirror fits is formed in the mirror support member, and the three protrusions are provided on the wall surface of the support hole, and the protrusions t are brought into contact with the surface side of the mirror; An elastic member made of a leaf spring is press-fitted between the surface of the mirror, the back surface of the mirror on the opposite side, and the wall surface of the support hole, and the direct or indirect abutting point of the leaf spring against the back surface of the mirror is The mirror support device is characterized in that the mirror support device is arranged substantially opposite each of the protrusions. (5) The mirror has a mirror support member that supports the mirror at three points using all three protrusions, and the mirror support member is supported so as to be movable along the reference member. In a mirror support device in an optical system. The three protrusions are brought into contact with the surface side of the mirror;
and two of the three protrusions are provided on the mirror support member portion closer to the reference member, and the other protrusion is provided on the mirror support member portion farther from the reference member. and the mirror support device.