JPS6134501Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a shutter release device for a single-lens reflex camera, and in particular has a spring that has a mutual relationship between a mirror raising lever and a shutter release lever, thereby regulating the operation of the mirror raising lever. The present invention also relates to a shutter release device for a single-lens reflex camera having a plurality of functions for gradually and quantitatively operating a shutter release lever.

Conventional shutter release devices require that a fixed amount of force, for example 70 grams, be applied to the shutter gradually within the permissible limit, and if force is applied suddenly or exceeds this limit, there is a risk of destroying the shutter, so various devices have been devised. I was being strained. For example, the shutter release lever is made of phosphor bronze to give it elasticity and slow its operation. However, due to the nature of the elastic material, it has poor moldability and is difficult to position.
There was also a method in which the shutter release lever was tensioned by a spring at a fixed point, and released when the mirror had finished rising to release the shutter. The mechanism becomes complicated because it requires a mechanism to tension the spring in advance and a mechanism to lock the shutter release lever until the mirror has finished rising. This has the disadvantage that the torque of the film winding lever increases because it is necessary to strengthen the film winding lever and to tension the film at the same time as winding the film. Furthermore, this device has the disadvantage that when the shutter release lever is released, the force of the spring is suddenly applied all at once, and in order to prevent this, a resistance is added to slow down the operation, which uses unnecessary force.

Therefore, the purpose of the present invention is to stabilize the operation of the mirror raising lever and the shutter release lever by providing springs that are associated with each other, and to gradually apply the necessary and sufficient force to the shutter release lever. To provide an inexpensive and compact shutter release device for a single-lens reflex camera having multiple functions.

Other objects and features of the present invention will become apparent from the following description and accompanying drawings.

The present invention will be explained below with reference to the drawings.

FIG. 1 is an overall perspective view of an embodiment of the present invention, FIG. 2 is an explanatory view showing the relative positions of the mirror raising lever and the shutter release lever before operation, and FIG. 3 after operation.

In the drawings, the mirror raising lever 8 has a convex portion 5 and a pin 10 around the shaft 12, as shown by the solid line in FIG. 1 or in FIG. 12 in a clockwise direction.

On the other hand, the shutter release lever 4 which has a cam part 3 that engages with the convex part 5 has a pin 9 opposite to the pin 10 near the cam part, and has a driven end 2 at the opposite end of the cam part to release the shutter. It is designed to be able to rotate counterclockwise about axis 1. Between pin 9 and pin 10 there is a spring 11 associated with both levers.

When the shutter button is pressed now and the operating point 7 moves as the mirror is raised, the mirror raising lever 10 rotates around the shaft 12 as shown by the two-dot chain line in FIG. 1 and in FIG. 3 and move the shutter release lever 4 counterclockwise around the shaft 1 with the spring 1.
1, the operating end 2 releases the shutter.

The function of the spring 11 provided between the pin 10 of the mirror raising lever 8 and the pin 9 of the shutter release lever 4 will now be described. In the locked state shown in Fig. 2, the mirror raising lever 8 is moved by the spring 11. The mirror is held in place and stabilized by being pulled counterclockwise. Now mirror up lever 8
When the shutter release lever 4 begins to operate clockwise, the spring 11 is gradually extended, and at the end point in FIG.
is adjusted so that the amount of force acting on the shutter locking member at the same end 2 is a predetermined value.

As mentioned above, in the present invention, a single spring is connected to the mirror raising lever and the shutter release lever, so that when the mirror is locked, it is pressed to a fixed position and stabilized, and when the mirror is in operation, it is stabilized. Gradually pull up the shutter release lever to prevent sudden force from being applied to the shutter all at once, and at the end of the spring's maximum extension, the force will function to give exactly the force required by the shutter, and one To provide a shutter release device for a single-lens reflex camera, which has a spring that reliably operates a plurality of functions, is inexpensive, has reliable operation, is small and lightweight, and is stable in positional relationship and force.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective explanatory view showing an embodiment of the present invention in a locked state, FIG. 2 is a partial explanatory view showing a locked state, and FIG. 3 is a partial explanatory view of the same at the end point of operation. The parts indicated by each code are shown below. 1,12...
Shaft, 2... Operating end, 3... Cam portion, 4... Shutter release lever, 5... Convex portion, 7... Operating point, 8
...Mirror lift lever, 9, 10...Pin, 11
...Spring.

Claims (1)

[Claims for Utility Model Registration] In a single-lens reflex camera: It has a mirror raising lever 8 that rotates around a shaft 12, and the lever 8 has a convex portion 5 and a pin 10 around the shaft 12, and the convex The portion 5 engages with the cam portion 3 of the shutter release lever 4 which rotates around the shaft 1;
The shutter release lever 4 is provided with a pin 9 at a position opposite to the pin 10, and has an operating end 2 at the opposite end of the cam portion that engages with the shutter engaging member, and between the pin 9 and the pin 10. This shutter release device for a single-lens reflex camera is characterized by a structure that includes a spring 11 to gradually engage a mirror raising lever 8 and a shutter release lever 4 to a required amount of force.