JPH07120834A - Camera - Google Patents

Abstract

PURPOSE:To assemble a main mirror holder into a mirror box without increasing the number of parts by integrally molding a supporting shaft and a supporting shaft bearing with a mirror and mirror box respectively, and constituting the base part of the supporting shaft or the supporting shaft bearing so that it can be easily elastically deformed. CONSTITUTION:The supporting shaft bearing is formed in the mirror box part, and the supporting shafts 41 and 42 formed in the main mirror holder 4 are fitted in the supporting shaft bearings and supported so that the holder 4 can be turned. The angle of the main mirror is fixed by a main mirror adjusting pin through the mai mirror holder 4. A slit 43 is formed just beside the supporting shafts 41 and 42 of the holder 4, so that it is formed at the tip of an arm-like part. By elastically deforming the arm-like part to the inside in the width direction of the holder 4, a distance between the supporting shafts 41 and 42 is shortened and the holder 4 is interposed between the supporting shaft bearings of the mirror box.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera, and more particularly to a camera in which a front frame serving as a lens mount mounting member and a mirror box for holding a mirror are integrally formed of plastic.

[0002]

2. Description of the Related Art In a conventional camera in which a front frame and a mirror box are integrally formed of plastic as described above in order to reduce the number of parts and downsize, a supporting bearing is a mirror box. In the case of being constructed integrally, as shown in FIG. 17, the support bearing 5 of the mirror box 51 is used.
In addition to 2, the main mirror holder 53 is also provided with a support bearing 54,
Further, a support shaft 55 that is separate from the main mirror holder 53 and the mirror box 51 is provided, and these support bearings 52 and 54 are provided.
It is known that the support shaft 55 is rotatably supported by passing through the support shaft 55 on both sides. In this case, the main mirror holder 53
And a support shaft 55 as a member separate from the mirror box 51.
Is required, and the number of parts is increasing.

Further, in Japanese Patent Laid-Open No. 3-233544, as shown in FIG. 18, a U-shaped groove 62 is formed on a side surface of a mirror box 61, and a spindle 63 is received in the groove, and another member is provided. It is also known that the main mirror holder 65 is supported by a structure in which the support shaft 63 is pressed by the plate spring 64. However, also in this case, the leaf spring 64 that presses the support shaft 63
However, it is necessary as a separate member from the mirror box 61 and the main mirror holder 65, and the number of parts is large.

In each of the above-mentioned examples, the number of parts is increased as a result of various efforts to attach the main mirror or the main mirror holder to the mirror box, and the front frame and the mirror box are integrally molded to form parts. The result is contrary to the goal of reducing the score. The present invention, in view of the technical irrational in these conventional techniques,
It was created to solve this effectively. Therefore, an object of the present invention is to provide a camera in which a front frame and a mirror box are integrally formed of plastic, and in which the main mirror holder can be assembled in the mirror box without increasing the number of parts.

[0005]

The camera according to the present invention comprises:
In order to solve the problems of the prior art as described above and to achieve the object, it is configured as follows. That is, a mirror box that is arranged in front of the focal plane shutter in the camera body and is formed integrally with the lens mount mounting member, and a mirror box that is arranged in the mirror box and is located between the subject image observation position and the shooting retract position. In a camera provided with a mirror means rotatable between the two, one of the one end of the mirror means is integrally formed with a support shaft or a support bearing, and the support shaft of the mirror means is provided on both side walls of the mirror box. Alternatively, either a support bearing or a support shaft corresponding to the support bearing is integrally molded, and at least one portion of a base portion on which the support shaft or the support bearing is formed is configured to be easily elastically deformed.

[0006]

In the camera according to the present invention, since the support shaft and the support bearing for rotatably supporting the mirror means on the mirror box are integrally formed on the mirror box or the mirror means, other There is no need to provide a separate member. Moreover, at the location where the base is integrally molded and is easily elastically deformed, the location is elastically deformed, so that the mirror means can be assembled to the mirror box without the need for another separate member. To do.

Therefore, the main mirror holder can be assembled to the mirror box without increasing the number of parts without violating the purpose of reducing the number of parts by integrally molding the front frame and the mirror box.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the camera according to the present invention will be described below with reference to FIGS. FIG. 1 is an explanatory view showing a schematic configuration around a mirror in a camera of this embodiment in a sectional view. In the figure, 1 is a lens mount, and 2
Is a lens mount attachment member (hereinafter referred to as a front frame). The front frame 2 has a box-shaped mirror box in which a main mirror 3 and a main mirror holder 4 for holding the main mirror 3 are provided. The main mirror 3 and the main mirror holder 4 have an observation position shown in the figure for observing a subject image formed by a lens (not shown) and a photographing position where the main mirror 3 is flipped up during photographing. Move between. When the main mirror 3 is at the observation position, the subject image reflected by the main mirror 3 is formed on the focusing screen 7. Focusing screen 7
Is held by a focusing plate holder 5 by a focusing plate pressing spring 6. The image formed on the focusing screen 7 is observed through the pentaprism 8 and the eyepiece lens 9. Reference numeral 10 in the drawing denotes a penta holder for holding the penta prism 8. The eyepiece lens 9 is held by an eyepiece lens holder (not shown).

A sub-mirror holder 11 which holds a sub-mirror 12 behind it is attached to the main mirror holder 4. The sub-mirror 12 reflects the light flux that has passed through the main mirror 3 when observing a subject image, and the distance measuring unit 13
Lead to. Then, these main mirror 3 and sub-mirror 1
A focal plane shutter 17 is arranged behind the optical axis of 2, and the main mirror 3 and the sub mirror 12 are flipped up at the time of shooting to open the shutter 17, and a film (not shown) behind the shutter 17 is exposed. It

On the bottom surface of the mirror box of the front frame 2, a photometric element 14 is held in a form sandwiched between a photometric element holder 15 and the front frame 2. Further, on the bottom surface of the mirror box, flocked paper 16 for antireflection is attached.

2 and 3 are explanatory views showing the mirror box portion 2 ₁ of the front frame 2 as seen from one side surface, and FIG. 4 is a front view of the main mirror holder 4. Support shafts 4 ₁ and 4 ₂ are formed on the main mirror holder 4 as shown in FIG. On the other hand, the mirror box portion 2 _1, is supported bearing 2 _2, 2 _3, as shown in FIGS. 2 and 3 are formed,
The main shafts 4 ₁ and 4 ₂ are fitted into the support bearings 2 ₂ and 2 ₃ to rotatably support the main mirror holder 4. The angle of the main mirror 3 is determined by the main mirror adjustment pin 18 via the main mirror holder 4, and the sub mirror 12 is rotated by the sub mirror stopper 19 described in detail later with reference to FIG. Adjustments are made. Note that FIG.
The sub-mirror stopper 19 shown in FIG. 13 is the portion shown as the sub-mirror contact pin 19 ₃ in FIG. As shown in FIG. 4, the spindles 4 ₁ and 4 ₂ of the main mirror holder 4 have slits 4 ₃ formed right next to the spindles 4 ₁ and 4 _{2 and} are provided in a form formed at the tip of the arm-shaped portion. Therefore, this arm-shaped portion is used as the main mirror holder 4
By elastically deforming inward in the width direction of the support shaft 4
The distance between ₁ and 4 ₂ can be shortened, and the main mirror holder 4
Can be sandwiched between the support bearings 2 ₂ and 2 ₃ of the mirror box portion 2 ₁ . Further, as shown in FIG. 2, one of the support bearings 2
₂ also, the upper end of the mirror box portion 2 ₁ is formed at the distal end of the arm-shaped portion protruding downwardly, the pinching it in further primary mirror holder 4 which is the arm-like portion bent easier. That is, at least by any one flexes, attached to the mirror box portion 2 of the _main mirror holder 4, a minimum number of components without constituting the support shaft to the main mirror holder and another of the arms shaped portion It will be possible with.

In the above embodiment, the support shafts 4 ₁ and 4 ₂ are formed on the main mirror holder 4 and the support bearings 2 ₂ and 2 ₃ are formed on the mirror box portion 2 _1. Of course, the support shaft may be formed in the mirror box portion and the support bearing may be formed in the main mirror holder. Further, a support shaft may be formed on one of both side walls of the mirror box and a support bearing may be formed on the other side wall, and a support bearing and a support shaft corresponding to these may be formed on the main mirror holder.

[0013] In this embodiment, the light shielding in the slit 4 ₃ to extend the distance measuring light beam restricting plate 22 shown by a chain line in FIG. 4 is performed by overlapping the slit 4 _3. If such a regulation plate is not needed, the mirror box section 2 ₁
The slits 4 ₃ can be eliminated by forming both of the support bearings 2 ₂ and 2 ₃ at the tips of the arm-shaped portions as described above so as to be elastically deformable.

5 and 6 show another embodiment of the support bearing portion of the mirror box portion. In the example of FIG. 5, the support bearing 2 ₃₀
The arm-like portion 2 ₃₁ forming the is extended from the bottom to the top. In the example of FIG. 6, by forming an opening 2 ₃₃ next to the supporting bearing _232, it forms a supporting bearing 2 ₃₂ to elastically deformable bridge-like portion 2 _34. If the thickness of the bridge-like portion 2 _34, the elastic deformation is further facilitated.

7 and 8 show the inner surface of the mirror box portion 2 ₁ , respectively. Part 2 ₅ that contains the vertical line, if showing an enlarged cross section of the part 9 on FIG. 8, are formed on the uneven surface, the rear of the light impinging on the inner surface with reflective film It is designed not to reach the face. Moreover, the inner surface thereof is made black to absorb most of the light. In this way, the antireflection structure in the mirror box portion is also integrated with the mirror box portion 2 ₁ , so that the strength of the mirror box portion itself increases, and the thickness of the mirror box portion for obtaining the required strength is Can be made thinner. Further, since the uneven surface portion ₂₅ is formed of plastic, the radius of curvature of the tip of the convex portion of the uneven surface can be made smaller than that of another press-formed conventional member, and the antireflection effect can be further enhanced. In addition, it is not necessary to paint by forming a grain in the black inner surface. In particular, this uneven surface portion 2
_{If 5} is created with a slide mold formed on the inner surface of the mirror box, the relief taper on the side surface of the mirror box is 1 °
It can be set as follows and is also suitable for preventing the mirror box from becoming large. Further, the bottom surface of the mirror box portion 2 ₁ is covered with the uneven portion 15 ₁ of the extension portion of the photometric element holder 15 and the flocked paper 16, but without extending the uneven portion of the side surface of the mirror box to the bottom surface of the mirror box, By forming the portion just above the bottom surface as the flat surface portion, it is possible to prevent a gap from being formed between the side surface of the mirror box and the flocked paper attached to the bottom surface. Further, if the flat portion is formed at substantially the same position as the concave portion of the side surface concave-convex portion, the flocked paper can be extended to the concave portion of the side surface.

Conventionally, the antireflection structure in the mirror box portion is constructed by press-molding a metal member separate from the mirror box portion, or by attaching another member such as flocked paper to the inner surface of the mirror box portion. Was there. These separate members hardly contributed to the strength improvement of the mirror box portion. That is, it hardly contributed to reducing the thickness of the mirror box portion. In addition, since the conventional press-formed uneven surface cannot provide a sufficient antireflection effect,
It was necessary to apply anti-reflection paint.

FIG. 10 is a view of the front frame 2 seen from above, and an auxiliary light unit for projecting auxiliary light for distance measurement is constructed, and its base plate 2 ₆ becomes a part of the front frame. There is. FIG. 11 is an enlarged view of the part of the auxiliary light unit.
D (light emitting diode) 23 and LED holder 24,
It is composed of a light projecting film 25 on which a light projecting pattern for imparting contrast to the projected light is drawn, and a light projecting lens 26 for condensing and forming light from the LED 23. LED2
3. In order to determine the positions of the light projecting film 25 and the light projecting lens 26, the LED 23 is pressed toward the light projecting film 25 by the part 2 _{7 of the} front frame, thereby determining the position in the optical axis direction. Further, the lateral position is configured to determined without backlash by the left and right protrusions 2 _8. Although not shown, the bottom of the LED holder 24 has a draft of 0.
It corresponds to that the contact surface of the front frame 2 is horizontal. Further, the contact surface of the LED holder 24 with respect to the light projecting film 25 is configured to cancel the draft of the vertical surface of the front frame 2 so that the optical axis does not shift. Further, the light projecting lens 26 is provided with a concave portion 2 _{9 on the} front frame.
Attached to. Light projecting lens 26, the convex portions 2 ₁₀ of the front frame
It is pressed by and is positioned in the optical axis direction, and its lateral position is determined by press-fitting the left and right convex portions 2 ₁₁ shown in FIG. The left and right protrusions 2 ₁₁ are
It is also possible to make one of them flat and make only one convex. Further, although the LED holder 24 and the light projecting film 25 are provided separately, it is possible to integrate them by a method such as transferring a pattern to the LED holder.

FIG. 10 shows a spacer 27 sandwiched between the front frame 2 and the focusing screen holder 5 shown in FIG. The left and right spacers 27 have the same shape and are fitted to positioning bosses 2 ₁₂ projectingly formed on the upper end surface of the front frame 2 to be positioned, thereby determining the position of the focusing screen holder 5.

[0019] FIG. 13 is a diagram showing a look at the side of the mirror box portion 2 ₁ from the outside. The sub-mirror stopper 19 shown in FIG. 3 is integrated with the lever portion 19 ₄ . The bearing portion 19 _{1 of the} lever 19 ₄ has a mirror box portion 2 ₁
The shaft portion 2 ₁₃ is fitted so as to be rotatable. The sub-mirror contact pin 1 is attached to one end of the lever portion 19 _4.
9 ₃ is formed, and a U-shaped groove portion 19 ₂ is formed at the other end. An eccentric pin 31 is fitted in the U-shaped groove 19 ₂ and when the eccentric pin 31 is rotated, the U-shaped groove 19 ₂
There therefore moved by the eccentricity, the sub-mirror contact pin 19 ₃ is also moved in accordance with the movement amount, the angle adjustment of the sub-mirror is performed by this operation.

The eccentric pin 31 is pressed by the eccentric pin retainer plate 32, because they are further pressed into the eccentric pin 31 itself sides of the mirror box portion 2 _1, mirror-up-down operation after the sub-mirror angle adjustment Even if it is carried out, it does not rotate due to the impact or vibration, and the angle of the sub-mirror that is adjusted first does not change.

Furthermore eccentric pin retainer plate 32, a bearing portion 19 ₁ of the lever portion 19 ₄ are also pressed, thereby preventing the lifting of the lever portion 19 _4. The main mirror balancer 33 is stopped by a balancer pressing plate 34, and has a weight 35 to increase inertial force. In addition, the main mirror balancer 33, the balancer return spring 36,
It is urged to the position shown when the mirror is raised. When the mirror is down, the main mirror holder contact surface 33 ₁ hits the main mirror holder 4 and rotates counterclockwise,
Bounds are suppressed by absorbing the kinetic energy of the main mirror holder 4.

The mirror box portion 2 ₁ of the side surface is formed with an opening 2 ₁₄ shown in FIG. 13, the opening 2 ₁₄ from the adjustment bit is inserted (not shown) main mirror adjustment pin 18
(See FIG. 2).

Further on the side surface of the mirror box portion 2 ₁ has a recess 2 ₁₅ for pressing the flexible substrate, the flexible substrate positioning boss 2 _16, screwed portions 2 ₁₇ of the presser plate is provided. FIG. 14 shows a state in which the first flexible substrate 28 and the second flexible substrate 29 are pressed against each other. Figure 1
5 shows a cross section of that portion. An elastic body 30 such as a rubber piece is provided in a concave portion 2 ₁₅ formed integrally with the mirror box portion 2 _1.
The first and second flexible substrates 28, 29.
By pressing the pressing plate 31 with each other, the patterns existing on the surfaces of the flexible substrates facing each other are electrically connected. Conventionally, it is difficult to form a concave surface with a mirror box made of metal,
Also, there was a problem of insulation, but in the present embodiment, since it is a plastic molded product, all the problems can be solved at once.

In this embodiment, the photometric element 14 is sandwiched between the front frame 2 and the photometric element holder 15 as shown in FIG. 1, but is fixed by screwing the photometric element holder 15 to the front frame 2. Since the photometric element 14 that receives light receives the light reflected by the film surface, the mirror box portion 2 ₁
It is desirable to be close to. Conventionally, since the upper and lower sides of the photometric element are held by the photometric element holder, the photometric element holder is provided at a position far from the mirror box by the holder thickness above the photometric element. Further, as shown in FIG. 1 and FIG. 16, the opening 15 ₂ through the light beam guided to the distance measurement unit 13, there is a possibility to reduce the distance measurement accuracy protrusions such as fluff protrudes, in the conventional opening It had been affixed antireflection member having a concave-convex portion of another material instead of flocking paper and urethane foam around parts, photometric element holder 15 the uneven portions of the same record and the inner side surface of the mirror box portion 2 ₁ The number of parts can be reduced by integrally molding with.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a schematic configuration around a mirror in a camera of this embodiment in a sectional view.

FIG. 2 is an explanatory view showing a mirror box portion of a front frame in the camera of the present embodiment as viewed from one side surface.

FIG. 3 is an explanatory diagram showing a mirror box portion of a front frame of the camera of the present embodiment as viewed from a side surface opposite to that of FIG.

FIG. 4 is a front view of a main mirror holder in the camera of this embodiment.

FIG. 5 is a view showing another embodiment of the support bearing of the mirror box portion in the camera of the present invention.

FIG. 6 is a diagram showing yet another embodiment of the support bearing of the mirror box portion in the camera of the present invention.

FIG. 7 is a diagram showing one inner surface of the mirror box portion of the front frame in the camera of this embodiment.

FIG. 8 is a diagram showing an inner surface of the mirror box portion of the front frame of the camera of the present embodiment on the opposite side to that of FIG.

FIG. 9 is an enlarged view showing a cross-sectional shape of a side surface of a mirror box portion in the camera of this embodiment.

FIG. 10 is a diagram showing a front frame of the camera of the present embodiment as viewed from above.

11 is an enlarged view of a main part of FIG.

FIG. 12 is a view showing a mounting and positioning structure of a light projecting lens of the auxiliary light unit in the camera of this embodiment.

FIG. 13 is a diagram showing a side surface of a mirror box portion in the camera of the present embodiment as viewed from the outside.

FIG. 14 is a diagram showing a connection state of flexible substrates in the camera of this embodiment.

FIG. 15 is a cross-sectional view showing a state in which the flexible substrate in FIG. 14 is pressure-welded.

FIG. 16 is a diagram showing a photometric unit mounting portion on the bottom surface of the mirror box portion in the camera of this embodiment.

FIG. 17 is a diagram showing an example of an assembled state of a mirror box and a main mirror in a conventional technique.

FIG. 18 is a diagram showing another example of an assembled state of the mirror box and the main mirror in the related art.

[Explanation of symbols]

1 lens mount 2 front frame 2 ₁ mirror box portion 2 _2, 2 ₃ supporting bearing 2 ₅ asperity surface portion 2 _six plate 2 ₇ front frame part 2 ₈ left and right protrusions 2 ₉ recesses 2 _10, 2 ₁₁
Convex part 2 ₁₂ Positioning boss 2 ₁₃ Shaft part 2 ₁₅ Recessed part 2 ₁₆ Positioning boss 2 ₁₇ Screw fixing part 2 ₃₀ Support bearing 2 ₃₁ Arm part 2 ₃₂ Support bearing 2 ₃₃ Opening part 2 ₃₄ Bridge part 3 Main mirror 4 Main mirror Holders 4 ₁ , 4 ₂ Spindles 4 ₃ Slits 5 Focus plate holders 6 Focus plate holding plates 7 Focus plates 8 Penta prisms 9 Eyepieces 10 Penta holders 11 Sub mirror holders 12 Sub mirrors 13 Distance measuring units 14 Photometric elements 15 Photometric element holders 15 ₁ Convexity of extension of photometric element holder 15 ₂ Opening of photometric element holder 16 Flocked paper 17 Focal plane shutter 18 Main mirror adjustment pin 19 Sub mirror stopper 19 ₁ Bearing part 19 ₂ U-shaped groove 19 ₃ Sub mirror contact pin 19 ₄ Lever Part 22 Distance-measuring light flux regulating plate 23 LED 24 LED holder 25 Light emitting film 26 Light emitting lens 27 spacer 28 first flexible substrate 29 and the second flexible substrate 30 elastic body 31 eccentric pin 32 eccentric pin retainer plate 33 main mirror balancer 33 ₁ main mirror holder contact surface 34 balancer retainer plate 35 weights 36 balancer return spring

Claims (1)

[Claims] 1. A disposed in front of the focal plane shutter in the camera body (17), the lens mount attachment member (2) and a mirror box formed by integrally formed (2 _1), the mirror box (2 ₁ ), And a camera provided with a mirror means (3, 4) rotatable between a subject image observation position and a photographing retreat position, in both sides of one end of the mirror means (3, 4). Either the support shaft or the support bearing (4 ₁ , 4 ₂ ) is integrally molded, and the support shaft or the support bearing (4 ₁ , 4) of the mirror means (3, 4) is formed on both side walls of the mirror box (2 ₁ ). 4 ₂ ) corresponding to either the support bearing or the support shaft (2 ₂ , 2 ₃ ) is integrally molded, and the support shaft or the support bearing (2 ₂ , 2 ₃ , 4 ₁ , 4 ₂ ) is formed on the base portion. At least one part of which is configured to be easily elastically deformed. La.