JPH0648502Y2 - Mirror mounting mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial application field" The present invention is a mirror mounting in which a plurality of mirrors are arranged in a mirror frame arranged in a camera body so as to be rotatable by a predetermined angle with a supporting shaft as a fulcrum. Regarding the mechanism, especially the improvement of the mirror mounting mechanism that integrally arranges the main mirror that guides the light flux that has passed through the shooting lens to the viewfinder and the auxiliary mirror that guides the light that has passed through the main mirror to the detector that detects the focus state etc. Regarding

"Prior Art" Conventionally, a single-lens reflex camera that redirects light that has passed through a taking lens by a mirror and guides it to a finder is known, and in this type of camera, multifunctionalization has been remarkable in recent years, and in particular, the taking lens has passed through. Various types of devices have been developed that receive light and perform automatic exposure (photometry) or automatic focus (distance measurement). In such devices, the distance measurement sensor is located at a position that does not interfere with the light receiving position of the main mirror. Therefore, it is generally preferable to provide one or a plurality of auxiliary mirrors outside the main mirror for redirecting the light transmitted through the main mirror and guiding the light to the respective sensors. .

As a mirror mounting mechanism in which a plurality of such mirrors are integrally arranged in a mirror frame, there are Japanese Utility Model Publication No. 51-4902, and Japanese Patent Application No. 61-229815 previously proposed by the applicant. None of them has a mechanism for adjusting the turning angle of the mirror.

"Problems to be solved by the invention" However, when a plurality of mirrors are mounted on the mirror frame, it is extremely difficult to accurately position the mounting angle of the mirror frame, and the mirror frame is frequently rotated according to the shutter operation. In order to move and stop, the mounting angle of the mirror may float over time, and the deflection position of the light beam may shift slightly.

In particular, in the auxiliary mirror, since the sensor itself is extremely small, there is a case where a slight deviation of the deflecting position causes a shortage of the light amount and other obstacles to cause a smooth operation.

Further, a supporting shaft 11 for rotatably supporting the mirror frame 4 is generally fitted and fixed in a hinge portion 10a of the mirror frame 4 as shown in FIG. 4, and the hinge portion 4a is accorded on the camera body side. In order to facilitate the rotation of the mirror frame 4 by arranging it in the support groove 101 formed in the R-shaped wall 63 in an R-shape, the support groove 101 can be easily rotated. There is a risk that a part of the light flux A transmitted through the taking lens will enter the gap between the hinge portion 4a and the hinge portion 4a, and diffusely reflect between the support groove 101 and the hinge portion 4a while exposing the film located on the back side when the shutter is opened. There is.

In view of the above-mentioned drawbacks of the prior art, the present invention provides a mirror mounting mechanism capable of easily and accurately adjusting the turning angle of each of the mirrors both during manufacture and during use and handling. With the goal.

[Means for Solving the Problems] In order to achieve the technical problem, the present invention sways the one side of each of the plurality of mirrors by a pressing force urged toward a protrusion provided on the mirror frame. A mirror that is movably supported, a point that an adjustment screw is screwed from the rear side of the mirror frame located on the opposite side of the mirror of the fulcrum, and a point that the mirror reflection angle can be adjusted by the adjustment screw. A mounting mechanism is proposed.

[Operation] According to the technical means, one or a plurality of mirrors are supported by a plurality of points, preferably three or four points, by the protrusion and the adjusting screw while being pressed and held by the biasing force. The turning angle of each of the mirrors can be easily and easily and accurately performed by turning the adjusting screw of the mirror up and down or vertically and horizontally, and particularly, the biasing position of the biasing force can be set on the mirror frame. The bending of the mirror can be completely prevented by setting the position corresponding to the abutting portion of the protruding portion and the abutting portion of the adjusting screw.

Further, the adjusting screw is preferably screwed along the parallel axial direction, and preferably, the head is faced with a lid portion which can be opened and closed, whereby the camera lid portion can be easily opened. Because the adjustment screw can be opened,
It becomes possible to easily and easily adjust the turning angles of the respective mirrors both during manufacturing and during use and handling.

Further, in a preferred embodiment of the present invention, the supporting groove on the camera body side for supporting the hinge portion of the mirror frame is formed in a substantially V shape so that the supporting groove is gradually narrowed from the light incident side. Even if a part of the light beam that has passed through the shooting lens enters the gap between the support groove and the hinge part, it may be attenuated when passing through the gap and adversely affect the film located on the back side. Absent.

[Embodiment] Hereinafter, a preferred embodiment of the present invention will be exemplarily described in detail with reference to the drawings. However, unless otherwise specified, the dimensions, materials, shapes, relative positions, etc. of the components described in this embodiment are not intended to limit the scope of the present invention thereto, but merely illustrative examples. Nothing more than.

FIG. 3 shows a compact single-lens reflex camera according to an embodiment of the present invention. To briefly explain the schematic configuration of the camera, a camera body 50 will be described.
At the upper end of the front face of the flash unit, a strobe light emitting unit that constitutes a strobe unit 51 is provided, and at the lower center of the front vertical direction, a zoom system consisting of four groups of lens systems in which a lens shutter 52 is provided on the front face. The photographing lens 53 is provided so as to be exposed, and at the lower end of the front side of the camera body 50, a battery 54 serving as a power source for various electronic mechanism parts such as the strobe unit 51, the strobe unit 51 and the photographing lens 53. A power zoom driver 55 for performing zooming drive by a signal from an operation button (not shown) or the like is provided in the space of
Also, an AF driver 56 is provided. In the figure, reference numeral 57 is a strobe charging capacitor, and 58 is a printed circuit board provided with a control circuit for controlling the strobe flash state.

On the other hand, on the upper end side of the rear surface of the camera body 50, a finder section 59 for determining the field of view through the taking lens 53.
Is provided, and an opening closed by a lid body 60 that can be opened and closed is provided below the eyepiece lens, and a roll film 62 is provided to a film loading portion 61 formed inside thereof.
A cartridge 62 accommodating a can be loaded or unloaded.

Further, a bellows-shaped wall portion 63 is surrounded in the recessed space on the front side of the central portion of the film loading portion 61, and is rotatable on the front side of the bellows-shaped wall portion 63 about the support shaft 11 as a fulcrum by a predetermined angle. A supported mirror mounting mechanism 1 is provided.

The mirror mounting mechanism 1 will be described in detail later, but the taking lens 53
The main mirror 2 that redirects the light flux that has passed through to the finder section 59 and the auxiliary mirror 3 that guides the light that has passed through the main mirror 2 to the distance measuring sensor 66 that detects the in-focus state are fixed with the support shaft 15 as a fulcrum. It is configured by being integrally fixed to the mirror frame 4 that rotates at an angle. According to such a mirror mounting mechanism 1, the mirror frame 4 always cooperates with the wall 63 of the camera main body to shield the film photosensitive surface from light, so that the optical path from the taking lens 53 to the main body 2 of the camera main body 50 is blocked. The light is reflected obliquely upward and guided to the finder section 59 via the finder optical system 70, while the main mirror 2 is formed as a half mirror.
A part of the optical path from the photographing lens 53 that has passed through the main mirror 2 is deflected by the auxiliary mirror 3 for distance measurement, which is tilted on the back side by a predetermined angle, and is arranged on the back side of the battery 54 obliquely below it. By guiding the distance to the distance measuring sensor 66 side provided, the auto focus function can be exerted. Also, the support shaft when opened
By rotating the mirror frame 4 to a position indicated by an imaginary line in the drawing with 15 as a fulcrum, a light flux reaches the film photosensitive surface 67 via the taking lens 53, and an image is taken.

Further, the finder optical system 70 includes a first lens system 71 forming a first focal plane, a relay lens 72, a reflection mirror 73 arranged on the back side of the strobe unit 51, and a second lens system.
It consists of a second lens system 74 that makes up the focal plane.
On the front side of the lens system, an eyepiece shutter 79 is arranged to prevent the back light from the finder section 59 from being introduced into the film photosensitive surface 67 during photographing.

Further, the reflection mirror 73 arranged in the middle of the above-mentioned finder optical system 70 is composed of a half mirror, and a photometric element 76 is provided on the back side of the reflective mirror 73 via a photometric condenser lens 75.

In the figure, reference numeral 77 is a pressure plate as a film retainer laid on the inner surface of the lid 60, 78 is a film retainer roller inside the cover 60, and 79 is a film retainer roller on the film loading section side. Further, a motor serving as a drive source for winding and rewinding the film in the film loading section 61 described above is provided inside the winding spool 80.

Next, a mirror mounting mechanism, which is the gist of the present invention, will be described with reference to FIGS. 1A and 1B.

The mirror frame 4 has a substantially square shape, and has a rectangular recess 5 for mounting the main mirror 2 in the center of the front surface thereof, and has a right-angled triangular cross-section inclined downward by a predetermined angle from the center of the bottom surface of the rectangular recess 5. The second recesses 6 are respectively recessed.

The square recess 5 has a hemispherical boss 10 formed in the vicinity of one corner on the lower side, and the adjustment screws 6, 7 are screwed in the vicinity of both corners on the upper side along a direction orthogonal to the mounting surface of the main mirror 2. A pair of screw holes 8 and 9 for engraving are engraved. Also in the second concave portion 6, a pair of hemispherical bosses 11 and 12 is formed on one side of the inner side of the shorter side facing downward, and the first hemispherical boss 11 is located above the first hemispherical boss 11. One screw hole 14 for engaging the adjusting screw 13 is formed in parallel with the screw holes 8 and 9.

In addition, the rear end of the upper end of the mirror frame 4 has a hinge portion formed in an R shape.
4a is provided, and the support shaft 15 is fitted and fixed along the horizontal direction in the drawing from the side end portion of the hinge portion 4a.

Then, in order to attach the main mirror 2 and the auxiliary mirror 3 to the mirror frame 4, first, the adjustment screws 6, 9 are inserted in the screw holes 8, 9 14, respectively.
After screwing 7 13 together, a rectangular auxiliary mirror 3 is arranged on the lateral surface of the second concave portion 6 to perform three-point support by the pair of bosses 11 and 12 and one adjusting screw 13, and The auxiliary mirror 3 is held from the upper surface side so that the leaf springs 16 fixed to the bottom of the rectangular recess 5 located above press the bosses 11 and 12 contacting portions of the auxiliary mirror 3 and the adjusting screw 13 contacting portions. Fix it.

Next, the main mirror 2 is placed in the rectangular recess 5 and three-point support is performed by the one boss 10 and the pair of adjusting screws 6 and 7, and three fixed ones near the support position are fixed to the mirror frame 4 side. The main mirror 2 is pressed by the leaf springs 17, 18 and 19 so as to press the boss 10 abutting portion of the main mirror 2 and the adjusting screw 6 and 7 13 center portions, respectively.
Hold and fix from above. 20 and 21 are main mirrors 2 in the figure.
This is a temporary pressing plate to prevent the falling off of.

According to this embodiment, the main mirror 2 is elastically held by the leaf springs 17, 18, 19 while being supported by the one boss 10 and the pair of adjusting screws 6, 7 at three points as described above. Therefore, by selectively rotating the pair of adjusting screws 6, 713 with the boss 10 formed on the mirror frame 4 as a fulcrum, fine adjustment in the vertical and horizontal directions of the main mirror 2 is possible, and particularly Since the leaf springs 17, 18, 19 are configured to press the central contact portions of the adjusting screws 6, 7, it is possible to prevent the leaf springs 17, 18, 19 from being bent as much as possible.

Similarly, since the auxiliary mirror 3 is also supported at three points and elastically held by the leaf spring 16, by rotating one adjusting screw 13 starting from the pair of bosses 11 and 12, the mirror 3 is moved up and down. Since the fine adjustment is possible in the direction and the leaf spring 16 is configured to press the abutting portion of the adjusting screw 13, the leaf spring 16 can be prevented from being bent as much as possible.

Moreover, since the adjusting screws 6 and 7 13 are both arranged in parallel with the rear surface of the mirror frame 4, that is, facing the lid 60 on the camera body 50 side, they are used not only during manufacturing but also during use. The mirror can be easily adjusted even during handling, which is extremely convenient in handling.

The mirror mounting mechanism 1 thus formed
As shown in FIGS. 2 and 5, the support groove 24 provided on the front surface side of the bellows-shaped wall portion 63 on the camera body 50 side, which is formed in a substantially V shape so as to become gradually narrower than the light incident side. On the hinge part 4a
In a state in which is stored, the support shaft 15 is pivotally supported by a predetermined angle. As a result, even when a part of the light flux A transmitted through the photographing lens 53 is incident on the gap between the support groove 24 and the hinge portion 4a, it is attenuated when passing through the gap and is positioned on the back side thereof. The film is not adversely affected, and in particular, a strong force is applied to the mirror frame 4 during the mirror adjustment, and even if a slight gap is generated between the mirror frame 4 and the support groove 24 on the camera body 50 side, the light is effectively shielded. Is possible.

As shown in FIG. 5, the light shield is formed by forming a vertical U-shaped convex wall 4b on the three sides of the rear side of the mirror frame 4 excluding the hinge portion 4a, and the convex wall 4b is on the camera body side. The light-shielding effect can be further improved if the recess 63a is fitted into the recess 63a.
Incidentally, reference numeral 80 in the figure denotes a photosensitive surface of the film.

[Advantage of Invention] As described above, according to the present invention, it is possible to easily and easily adjust the turning angle of each of the mirrors both accurately during manufacturing and during use and handling. The biasing position of the pressing force biased to the R-shaped projection side provided on the mirror frame should be set to a position corresponding to the contact portion of the projection portion and the contact portion of the adjusting screw provided on the mirror frame. This has various remarkable effects such as complete prevention of bending of the mirror. .

[Brief description of drawings]

1A and 1B are a front view and a central longitudinal sectional view of a mirror mounting mechanism according to an embodiment of the present invention, and FIG. 3 shows a single lens reflex camera equipped with the mirror mounting mechanism. 2 and 4 are cross-sectional views of the essential parts showing the cross-sectional structure of the hinge part of the mirror mounting mechanism of the above-mentioned embodiment and the prior art.
FIG. 5 is a partially omitted schematic view showing a mirror mounting mechanism mounted in the camera. 2: Main mirror, 3: Auxiliary mirror, 10, 11, 12: Boss, 6, 7 13: Adjusting screw, 16, 17, 18, 19: Leaf spring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Shizuo Nakamura Inventor Shizuo-ku, Tokyo 6-27-8 Jingumae Tokyo Harajuku Office, Kyocera Co., Ltd. (72) Fumio Niizawa 6-27 Jingumae Shibuya-ku, Tokyo No. 8 Kyocera Co., Ltd. Tokyo Harajuku Office

Claims (5)

[Scope of utility model registration request] 1. A plurality of mirrors for guiding light transmitted through a photographing lens to a plurality of corresponding functional parts are provided in a mirror frame provided in a camera body so as to be rotatable by a predetermined angle with a support shaft as a fulcrum. In the mirror mounting mechanism described above, one side of the plurality of mirrors is swingably supported by the pressing force biased toward the R-shaped protrusions provided on the mirror frame, and the mirror is positioned on the opposite side of the fulcrum. A mirror mounting mechanism characterized in that an adjusting screw is screwed from the rear side of the mirror frame, and the mirror reflecting angle can be adjusted by the adjusting screw. 2. The utility model registration according to claim 1, wherein the urging position of the urging force is set at a position corresponding to the contact portion of the protrusion and the contact portion of the adjusting screw provided on the mirror frame. Mirror mounting mechanism 3. The mirror mounting mechanism according to claim 1, wherein the adjusting screw head faces a camera lid that can be opened and closed. 4. A utility model in which a support groove on the camera body side facing a hinge portion of a mirror frame for fixing the support shaft is formed in a substantially V shape so as to become gradually narrower than a light incident side. Mirror mounting mechanism according to claim 1 5. A utility model registration claim in which the plurality of mirrors are a combination of a main mirror that guides a light beam that has passed through a photographing lens to a finder and an auxiliary mirror that guides light that has passed through the main mirror to a detector. Mirror mounting mechanism