JPS59232329A - Mirror bound preventing device of camera - Google Patents

Abstract

PURPOSE:To prevent mirror bound by providing a member which charges elastically a stop pin so that it can be restored to the home position and is brought into contact with the stop pin to get over it when a mirror is moved backward. CONSTITUTION:When the shutter release operation is performed, a mirror driving motor 15 is operated to turn a kick-up cam 17 clockwise, and a cam roller 19 is slipped off from the apex, and a cam lever 18 is moved backward counterclockwise. Therefore, a mirror frame 8 rises by a torsion spring 11 to open a photographing optical path l. At this time, a striking projection 27 strikes a stopper pin 28 to rotate a rotary disc 29 against a tension coil spring 32, and it rises furthermore and is brought into contact with a mirror stopper 12. Since the stop pin 28 is detached from the striking projection 2 at this time, the rotary disc 29 is returned to a neutral holding position momently. Consequently, the striking projection 27 is brought into contact with the stop pin 28 to absorb mirror bound even if the mirror frame 8 is bounded, and the vignette phenomenon of a photographic image is avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mirror bounce prevention device for a single-lens reflex camera used, for example, as an endoscope camera.

Generally, a single-lens reflex camera having a single mirror shutter mechanism is used as an endoscope camera. The raising operation of the mirror in the mirror 7 lifting mechanism is performed by a motor. However, when this mirror rises, it hits a mirror stopper and is stopped.

However, when the mirror rises or hits a wall, the mirror returns to the shooting optical path side, causing vignetting of the image. Means for preventing this are known, but all of them have various drawbacks such as requiring a strong mechanism, resulting in a complicated and large structure and being prone to failure.

The present invention has been made in view of the above circumstances, and its purpose is to prevent mirror bounce of a camera by absorbing the pound when the mirror rises with a simple structure and reliably preventing image vignetting. The goal is to provide equipment.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

This embodiment shows the case of an endoscope camera.

Reference numeral 1 in FIG. 1 is a mirror, and this mirror 1 is pivotally mounted as described later, and has a first position (position shown in FIG. 1) that blocks the photographing optical path t, and a position that shields the photographing optical path t. It is rotatably mounted between a second position (the position shown in FIG. 4) in which it is not open. That is, this mirror 1 functions as a mirror shutter of an endoscope camera. mirror 1
A field lens 2 and a penta roof prism 3 are arranged above to receive reflected light from an object when they are in the first position, and constitute a finder optical system 4 for observing through an eyepiece (not shown). . In addition,
The field lens 2 is held by a lens frame 5, and the penta-roof prism 3 has its lower peripheral edge held by the lens frame 5.
At the same time, the upper surface is held down by a holding member 6. The holding member 6 has a pyramidal inner surface that closely fits into the upper three surfaces of the penta-roof prism 3, and is further elastically pressed by the other end of a pressing spring 7 whose one end is screwed and fixed to the lens frame 5. ing.

On the other hand, the mirror 1 is held by a mirror frame 8, and the upper end portion of the mirror frame 8 is pivotally mounted to a rotating shaft 9 provided on the camera body side. Further, the mirror frame 8 is biased by a twisting spring 11 constituting a first biasing means so as to rotate from the first position to the second position.

When the mirror frame 8 is moved to the second position, the mirror frame 8 is moved to the mirror frame 5 provided on the lens frame 5. l 2 to υ
It is supposed to stop. This mirror stopper 12 is made of maltbrene, for example.

Further, the mirror 1 is opened and closed by a mirror drive operation mechanism 13, which will be described below. Regarding the mirror drive operation mechanism 13, each of these parts is assembled on a board 14. The output shaft of the mirror drive motor 15 is connected to the flip cam 1 via a reduction gear train 16.
By operating the motor 15, the flip-up cam 17 is rotated clockwise in the figure, pushing up the cam roller 19 of the cam lever 18 and releasing it suddenly after a certain amount. It has become. The cam lever 18 is biased by a twisting spring 21 to rotate counterclockwise in the figure, and the cam roller 19 is brought into contact with the circumferential surface of the flip-up cam 17. Further, an operating lever 23 is pivotally attached to the shaft 22 of the cam lever 18. This operating lever 23 is formed with a receiver piece 24, and an adjustment screw 25 is screwed into the cam lever 18 side corresponding to the piece 24.
By abutting the tip of the receiver against the piece 24, the angle of inclination of both levers 18, 23 can be regulated and adjusted. The tip of the operating lever 23 engages with a pin 26 provided on the side of the mirror frame 8, and by twisting the mirror frame 8, the mirror frame 8 is rotated counterclockwise in the figure against the force of the spring 1. .

On the side wall of the rotating tip of the mirror frame 8, there is provided an abutment protrusion 27 that projects laterally.

Further, a stopper pin 28 is provided at a position on the trajectory of the abutting protrusion 27 when the mirror frame 8 rotates, and at a position where it hits the abutting protrusion 27 when the lens frame 5 reaches near the second position.
is provided.

The stopper bin 28 is located on a line connecting the mounting ring 9 to the circumferential portion of the rotating disk 29 which is pivotally supported on the base plate 14. Further, the rotary disk 29 is pulled by a tension coil spring 32 constituting a second biasing means so as to position the four-horn bin 28 at that position. One end of the tension coil spring 32 is connected to a protrusion 33 protruding from the circumference of the rotating disk 29, and the other end is attached to a protrusion 34 protruding from the base plate 14. However, the rotating disk 29
is elastically biased when rotated in any direction from its neutral position, and elastically returns to its neutral position.

Next, the lj+ operation of the mirror shutter mechanism will be described.

First, after the shirt release operation is completed, the mirror drive motor 15 is activated (41?). Then, the flip cam 17 is rotated clockwise via the reduction gear train 16. As a result, the cam lever 18 is similarly rotated clockwise, and the cam lever 1-8 also rotates the operating lever 23 clockwise via the adjusting screw 25 and the receiver piece 24.

When the similar frame 8 is twisted by the operation lever 23, it resists the urging force of the spring 11 and returns to the first position (the position shown in FIG. 1).
is made to wait. In this state, the main image is reflected by the mirror 1 toward the finder optical system 4, so that it can be observed from the finder eyepiece.

When the shirt release operation is performed, the mirror drive motor 15 operates, and when the flip-up cam 17 is rotated clockwise via the reduction gear train 16, the cam release 4-18 is activated as shown in FIG. cam roller 19 comes off its apex,
The camray 18 is rotated counterclockwise by the twisting spring 21 and is instantly retracted. For this reason, when the mirror frame 8 is also twisted, it is raised 111 by the force of the spring 11, opening the photographing optical path t, allowing the photographing light to enter the film, and photographing is performed.

Further, when the mirror frame 8 rises as shown in FIG. 2, its abutting protrusion 27 abuts against the stopper or bottle 28, causing the rotary disk 29 to rotate against the biasing force of the tension coil spring 32. During this process, a brake is applied to the mirror frame 8, and the mirror frame 8 further rises to the position shown in FIG. 3, where it appears in the mirror stock 12. At this time, as the rotating disk 29 rotates, the stopper pin 28 comes off the abutting protrusion 27 on the mirror frame 8 side, so the rotating disk 29 is instantly moved to the neutral standby position shown in FIG. 4 by the biasing force of the tension coil spring 32. return. The tab and stopper pin 28 instantly fit under the abutment projection 27. Therefore, the mirror frame 8 is
Even if #12 K hits and rebounds, the collision projection 27 hits the stopper bin 28 and the rebound is absorbed. In other words, the mirror pound is absorbed and returned to the photographing optical path L@il, and the phenomenon of vignetting of the photographed image can be avoided.

After photographing, the mirror 1 is returned to the first position shown in FIG. 1 by the mirror drive operation mechanism 13 as described above.

In the above embodiment, the stopper bin is attached to the rotating disk, but the present invention is not limited thereto. For example, a lever or a slider member may be used in place of the rotating disk.

As explained above, the present invention elastically biases the stopper and the bottle so that they can return to their normal positions. Since the mirror bounce is absorbed by the above-mentioned S/'P pin, it is possible to prevent the photographed image from being vignetted by the member on the mirror side. Moreover, the structure can be extremely simplified and miniaturized, and
The occurrence of failures can also be reduced.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is an explanatory diagram showing its schematic configuration, and FIGS. 2 to 4 are explanatory diagrams sequentially showing the operation status of its main parts. 1... Mirror, 4... Finder optical system, 8...
Mirror frame, 1... Twisting spring, 12... Mirror stopper, 13... Mirror drive operation mechanism, 28... Stopper bin, 32... Tension coil spring. Applicant's representative Patent attorney Takehiko Suzue Figure 3 Commissioner of the Patent Office Kazuo Wakasugi■, Petition for Small Case Indication II! No. 58-107363 No. 2, Name of the invention Camera mirror/clamp prevention device 3, Relationship with the person making the amendment Patent applicant (037) Orin ξ Optical Industry Co., Ltd. Nikinsha 4, Agent 6, Amendment Full text of the subject specification 7, Contents of the amendment 7Y of the specification (with no change in u1) Procedural amendment, g4v4do8・I, j288 Commissioner of the Patent Office Kazuo Wakasugi■, Patent application for indication of the case 1982 -107363 No. 2- Name of the invention: Camera mirror bounce prevention device WI゛:'L'i'lli, ilE Relationship with the Kazuaki incident Patent applicant and 111, (tl: +7) Olympus Optical'': Sokko 4, agent (j auxiliary city's text) invited MJl, drawing 7, contents of amendment (1) specification box page 4 ] line ``at'' was changed to ``towards'' (2) Add “habo” next to “connect with” on page 6, line 13 of the specification. 131 Lines 6 to 7 of page 7 of the specification In line 18, “
First of all, it can be observed. ” Explore. (4) In the specification, page 9, lines 7 to 9, “After the exposure is completed...” is changed to “After the exposure is completed.”
The mirror drive motor 15 starts operating, and the reduction gear train 1
The jump via 6 causes the cam 17 to rotate clockwise. As a result, the cam lever 18 is also rotated clockwise,
The cam lever 18 also rotates the operating lever 23 in the supporting direction via the adjusting screw 25 and the support piece 24. Then, the mirror frame 8 is made to stand by at the first position (the position shown in FIG. 1) by the operation lever 23 against the biasing force of the torsional spring 1. In this state, the main image is reflected by the mirror 1 toward the finder optical system 4 and can be observed. ”. (Figures 2 and 4 in Figure 51 Figure 1n1 are corrected as shown in the attached sheet. Figure 2 Figure 4 Figure 5

Claims (1)

[Claims] a mirror that is rotatable about a rotation axis between a first position that blocks the photographing optical path and a second position that does not block the photographic optical path; a first biasing device that biases the mirror toward the first position; and a first biasing device that moves the mirror from the second position to the first position against the biasing force of the biasing device and corresponds to a shirt release operation. a mirror drive operation mechanism that is disposed on the second position side and hits a member on the mirror side when the mirror moves to the second position, and elastically returns to its home position and the member A mirror bounce prevention device for a camera, comprising a stopper pin that can be climbed over after being hit, and a second urging means for urging the stopper pin to the above-mentioned fixed position.