JPS5922494Y2 - Pointer lock device in exposure meter - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a pointer locking device in a single exposure meter.

Conventionally, in this type of exposure meter, the pointer can be locked to prevent it from swinging by operating a button except when necessary, for the purpose of preventing the pointer from being damaged or deformed, or to make it easier to read the exposure value at the point where the pointer oscillates. Although such devices have been proposed and put into practical use, they have had problems in that the buttons are located in locations that are relatively difficult to operate, and the mechanism is unstable.

Furthermore, if you want to see changes in illuminance, you have to keep pressing the button, which is very inconvenient.

In view of the above-mentioned circumstances, the present invention provides a trigger opening device in which the operation button is placed at the rotation center of the exposure value calculation dial, and the operation can be performed reliably and is excellent in operability. To explain this in detail based on an example shown below, 1 is made of transparent acrylic resin, etc., and has a through hole 1a in the center and a protrusion 1b on the inner surface. 2 is aligned with the upper body case 1 and fixed to the upper body case 1 by a mounting screw (not shown); 3 is rotatably connected to the lower body case 2 by a joint 4; The light-receiving unit case 5 is an exposure value calculation dial mounted on the top surface of the upper main body case 1 so as to be frictionally rotatable, and its detailed structure is as follows.

That is, 6 is a screw 7 and a nut 8 so as to cover the through hole 1a.
A dial holder 9 fixed to the upper main body case 1 by
10 is a dial ring that is rotatably fitted to the dial holder 6 and has windows 9a, 9b, an aperture scale 9C1 index 9d, a light value scale 9e, etc. on the upper surface; 10 is an upper body case 1 and a dial ring 9; 11 is a cylindrical shaft embedded in the dial holder 6, and 12 is a spring washer that is placed between the valve cover and allows the dial ring 9 to rotate by friction. Together with the extended click spring 13, they are fixed to the dial holder 6 by screws 14, and there are, for example, a shutter speed scale 12a appearing in the window 9a of the dial ring 9, and for example an exposure value scale 12b and a film sensitivity scale 12C appearing in the window 9b. 15 is a transparent dial cover rotatably fitted onto the cylinder shaft 11, and 16 is a window 16a attached to the inner surface of the dial cover 15 to display the film sensitivity scale 12C. 17 is a metal ball that is placed between the click spring 13 and the opaque plate 16 to allow the dial cover 15 to be rotated by friction. The exposure value calculation dial 5 is constituted by each of the above elements.

Numeral 18 is a hollow set screw screwed onto the cylinder shaft 11 to prevent the dial cover 15 from coming off. Numeral 19 is inserted through the cylinder shaft 11 and the set screw 18 in common, and the cylinder shaft 11 and the set screw 19 are inserted in common. an operation button that is slidably supported by 18 and has an indicator 19a on the top surface for indicating the operation state;
20 is a press plate rotatably fitted to the lower end of the operation button 19 and slidably fitted onto a pin 6a implanted in the dial holder 6, and has a bent portion 20a; 21 is a set screw 22; The lock lever is fixed to the lower end of the operation button 19 by
123 is a coil spring interposed between the cylinder shaft 11 and the operating button 19 to press the operating button 19 upward in the position shown in FIG. 2; 24 is a coil spring fixed to the movable coil shaft 25 of the exposure meter. (26 is a scale plate provided with a light value scale 26a that is attached to the lower main body case 2 and cooperates with the exposure meter pointer 24; 27 is a pair of brackets fixed to the lower main body case 2 by a shaft 28) 29.29 (FIG. 4) is rotatably supported and can hold the light meter pointer 24 together with the side that can come into contact with the bent portion 20a of the pressing plate 20 and the pointer receiver 30 fixed to the scale plate 26. A frame-shaped pointer deterrent lever 31 having a bent portion 27 a
This is a spring for biasing the exposure meter pointer 24 in the right rotation direction, that is, in the direction of inhibiting the exposure meter pointer 24 at the position shown in the figure.

In the above case, when the operating button 19 is fully pushed in the direction of the arrow in the position shown in FIG. The stroke of the operation button 19 is selected so that the robot escapes just in time.

Since the device of the present invention is constructed as described above, in the state shown, the restraining lever 27 is held by the spring 31 in the right-handed state at the position shown in FIG. It is held in an immovable state by being held by the receiver 30.

If the operating button 19 is pressed in this state, the pressing plate 20 and the lock lever 21 will descend together with the operating button 19, and the bent portion 2
Since the lower end edge of 0a contacts the pointer restraining lever 27 and causes it to rotate to the left, the lower end edge of the bent portion 27H moves away from the exposure meter pointer 24 (the position shown by the chain line in FIG. 2), releasing the pointer 24 from being restrained. do.

Therefore, the exposure meter pointer 24 is displaced according to the illuminance of the subject at that time and indicates an appropriate light value, but if the operation button 19 is released from the pressure at this time, the operation button 19 is moved by the coil spring 2.
3 returns to the illustrated position again, and at the same time, the pressing plate 20 and lock lever 21 also return to their original positions.
The pointer restraining lever 27 is rotated to the right by the spring 31 to stop the exposure meter pointer 24 at its deflection position.

As described above, when the operation button 19 is fully pushed in (as shown by the chain line in FIG.
In order to escape from the through hole 1a and move to a position slightly below the inner surface of the case 1, by turning the pressed operation button 19 in the direction of the arrow in Fig. 1, the lock lever 21 is also integrated with it. It rotates and reaches the position indicated by the chain line in Figure 3.

Therefore, if the pressure on the operation button 19 is released in this state, the lock lever 21 will come into contact with the inner surface of the upper body case 1, so the operation button 19 and the press plate 20 will both be held in the pressed position, and the exposure meter pointer will be held in the pressed position. 24 remains movable.

This state is indicated by the position of the indicator 19a,
To release this state, the operation button 19 can be turned in the direction opposite to the arrow in FIG.

That is, by turning the operation button 19 in the opposite direction of the arrow, the lock lever 2
1 returns to the position aligned with the through hole 1a again, and therefore returns to the illustrated position at the same time as the pressing of the operation button 19 is released, as described above, and the exposure meter pointer 24 is restrained in an immovable state.

In this case, the rotation range of the operation button 19 is restricted by the protrusion 1b or pin Oa against which the lock lever 21 comes into contact, so that there is no possibility of erroneous operation.

As is clear from the above explanation, when measuring illuminance, if the purpose is achieved by simply shaking the exposure meter pointer 24 momentarily, it is sufficient to simply press and release the operation button 19, and when you wish to see changes in illuminance. All you have to do is push the operation button 19 and turn it, but in either case the operation can be performed extremely quickly and easily.

The method of using the exposure value calculation dial 5 is not directly related to the present invention and is well known, so a detailed explanation will be omitted.

In the embodiment described in detail above, the exposure meter pointer 24 is made movable when the operation button 19 is pressed.
By changing the rotational fulcrum position of the pointer suppression lever 27 and the tensioning method of the spring 31, it is possible to configure the exposure meter pointer 24 to be in an immovable state only when the operation button 19 is pressed. Variations are within the scope of the present invention.

Further, the configuration of the exposure value calculation dial 5 is merely an example, and it goes without saying that the present invention can be applied to various other known types of exposure value calculation dials.

As mentioned above, according to the present invention, since the operation button is placed at the rotation center of the exposure value calculation dial, it is not only possible to perform the operation extremely easily and reliably in practice, but also the operation button is not exposed like in conventional products. Compared to models that protrude from the side of the meter body, the entire exposure meter is extremely compact, and the structure allows the operation button to be held in the operating position, making it easy to operate. There are advantages.

[Brief explanation of the drawing]

FIG. 1 is a front view of a main part of an embodiment of a light meter equipped with the device of the present invention, FIG. 2 is a sectional view of a main part taken along line II-II in FIG. 1, and FIG. FIG. 4 is a partial view taken along line III, and FIG. 4 is a partial view taken along line IV--IV in FIG. 1... Upper main body case, 2... Lower main body case, 3... Light receiving part case, 9...
・Exposure value calculation dial, 19... Operation button, 2
3...Coil spring, 20...Press plate, 21...Lock lever 122...
・Set screw, 24... Exposure meter pointer, 27...
... Pointer suppression lever 30 ... Pointer receiver, 31
······spring.

Claims (1)

[Scope of utility model registration request] An exposure meter having an exposure value calculation dial rotatably mounted on the top surface of a main body case, comprising: an operation button rotatably mounted on the center of rotation of the dial, and having an upward return habit due to a spring; a lock lever that is fixed to the lower end of the operation button and is prevented from moving upward by the upper main body case when the operation button is pressed and rotated by a predetermined angle;
A press plate is fitted to the lower end of the operation button so as to move up and down together with the operation button, and the press plate is rotatably supported in a vertical plane by the lower main body case and has a rotational habit of restraining the pointer by a spring. 1. A pointer locking device comprising: a pointer inhibiting lever which is provided and rotated in a direction to release the inhibition of the pointer by lowering the pressing plate.