JPH01185531A - Lens barrier opening and closing mechanism for camera - Google Patents

Abstract

PURPOSE:To open and close a lens barrier without moving a moving lens barrel unnecessarily by holding the moving lens barrel in a stop state within the prescribed circular motion range of a pin member and allowing only the circular motion of the pin member, and opening and closing the lens barrier by the circular motion. CONSTITUTION:The pin member 1 is fixed nearby the outer periphery of a disk 8 arranged above a lens barrel moving lever 2 eccentrically from the center on its reverse surface and enters the circular motion by the rotation of the disk 8. The disk 8 is coupled with a driving gear 9 arranged on the top surface of a fixed cylinder 3 through a shaft 10 and rotates by motor driving through a gear mechanism including a gear 11 engaging the driving gear 9. Then the lens barrel moving lever 2, i.e. moving lens barrel 4 is held in a stop state within the prescribed circular motion range of the pin member 1 and the lens barrier 7 is opened and closed by the circular motion. Consequently, the lens barrier 7 is opened and closed without moving the moving lens barrel 4 unnecessarily.

Description

[Detailed description of the invention] [Industrial application fields] The present invention relates to a lens barrier opening/closing mechanism for a camera.

[Description of Prior Art] For example, as an opening/closing mechanism for a lens barrier in a two-point camera, after a motor-driven movable lens barrel is retracted to a standard photographing position, the lens barrel is further retracted, and this extra mirror is removed. A device in which the lens barrier is opened and closed by moving the body is known. According to such an opening/closing mechanism,
Since space is required to share the extra movement of the lens barrel, there are problems such as increasing the size of the camera body.
This was not particularly desirable for compact cameras.

[Object of the Invention] The present invention has been made based on the above-mentioned viewpoint, and its object is to provide a lens barrier opening/closing mechanism for a camera that can open and close the lens barrier without excessively moving the lens barrel. It is in.

[Means for Achieving the Object] In the present invention, a pin member that moves circularly by motor drive, one end of which is rotatably supported and the other end engaged with a movable lens barrel, and the rotation of the pin member causes the aforementioned movement. A lens barrel moving lever for moving the lens barrel forward and backward, converting the circular motion of the pin member into rotational interlocking of the lens barrel moving lever, and stopping the lens barrel moving lever within a predetermined circular motion range of the pin member. The lens barrier opening/closing mechanism of the camera has a means for holding the pin member in a circular motion and allowing only circular motion of the pin member, and a means for opening and closing the lens barrier by circular motion of the pin member within the predetermined range of circular motion. Achieve your purpose.

In other words, within a predetermined range of circular motion of the pin member, the lens barrel moving lever, that is, the movable lens barrel, is held in a stopped state, and only the pin member moves in a circular manner, and this circular movement opens and closes the lens barrier. No need to move extra.

Embodiment of the invention] FIG. 1 is a block diagram showing an embodiment of the invention, and FIG.
FIG. 6 is a diagram showing the relationship between the lens barrel moving lever, the pin member, and the first opening/closing lever in the configuration shown in the figure.

In the figure, l is a pin member, 2 is a lens barrel moving lever, 3 is a fixed barrel, 4 is a movable lens barrel, 5 and 6 are first and second opening/closing levers, and 7 is a lens barrier.

The pin member l is fixed near the outer periphery of the lower surface of the disc 8 disposed above the lens barrel moving lever 2, and is shifted from the center of the disc 8, and is configured to move circularly as the disc 8 rotates. The disk 8 is connected to a shaft 1 by a drive gear 9 disposed on the upper surface of the fixed cylinder 3.
0, and is rotated by a motor through a gear mechanism (not shown) including a gear 11 that meshes with a drive gear 9.

The lens barrel moving lever 2 is an elongated plate whose one end 2a is rotatable via a shaft 12 held in the fixed barrel 3.
A drive pin 13 is provided at the other end 2b. The drive pin 13 engages with a long groove 14 formed on the top surface of the movable lens barrel 4, and when the lens barrel moving lever 2 rotates about the shaft 12, the movable lens barrel 4 is moved relative to the fixed barrel 3. It moves forward and backward. A driving groove 15 is formed between one end 2a and the other end 2b of the lens barrel moving lever 2 to engage with the pin member l.

As shown in FIG. 2, the drive groove 15 has a drive region 15a (a-b
(between a and c), and a non-driving area 15b (between a and c) in which the lens barrel moving lever 2 is held in a stopped state and only circular movement of the pin member 1 is allowed. The drive region 15a is formed along the longitudinal direction of the lens barrel moving lever 2, and the pin member l is formed in the drive region 15.
While engaged with the pin member 1, the lens barrel moving lever 2 is rotated by the circular movement of the pin member 1. Non-driving area 1
5b has a circular arc shape along the trajectory 'sla of the circular motion of the pin member 1, and while the pin member 1 is engaged with the non-driving area 15b,
The lens barrel moving lever 2 is in a stopped state, and only the pin member 1 moves circularly. The lens barrel moving lever 2 moves from the boundary position a between the drive range 15a and the non-drive range 15b to the drive range 1.
Position 5a rotates in the d direction by the circular movement of the pin member 1 toward fib, and rotates in the e direction by the circular movement of the pin member 1 from the position toward the boundary position a. While the pin member 1 is engaged with the non-driving area 15b, the pin member 1 is stopped in the same state as when the pin member 1 is at the boundary position a.
The movable lens barrel 4 reaches the maximum retreat position when the pin member 1 reaches the boundary position a, and reaches the maximum forward position when the pin member 1 rotates to the drive range 15a.

The first opening/closing lever 5 is an abbreviated plate member, and is rotatable via a shaft 16 held in the fixed cylinder 3. The first opening/closing lever 5 has one end 5a in a non-driving area 15b of the driving groove 15.
is engaged with the circularly moving pin member 1, and the other end 5b rotates in the f direction by the circular movement of the pin member 1 from the boundary position a to the position C of the non-drive area 15b, and from the position C to the boundary position a Due to the circular movement of the pin member l toward g, the force of the spring 17
It is provided so that it can rotate in the direction. When the first opening/closing lever 5 is not engaged with the pin member l, the spring 1
7 in the g direction and comes into contact with a stopper 18 provided on the fixed cylinder 3, so that it does not rotate in the g direction more than necessary.

The second opening/closing lever 6 is an abbreviated plate material similar to the first opening/closing lever 5, and is rotatable via a shaft 19 held on the side wall of the fixed cylinder 3. The second opening/closing lever 6 has one end 6
a engages with the other end 5b of the first opening/closing lever 5, and the other end 6
b is rotated in the h direction by rotation of the first opening/closing lever 5 in the f direction, and lens barrier 7 is rotated by rotation of the first opening/closing lever 5 in the g direction.
It is rotated in the i direction by a spring 20 that urges the opening direction.

The lens barrier 7 is provided on the front surface of the movable lens barrel 4, and the barrier members 22 and 23 are opened and closed by rotation of an opening/closing ring 21 rotatably provided on the front surface of the lens barrel 4. The barrier members 22,23 are attached to the fixed shafts 24,2
．． The drive shafts 26 and 27 are rotatably supported by the drive shafts 26 and 27, respectively.
It engages with the opening/closing ring 21 via. Opening/closing ring 2
1 includes an arm portion 21a that engages with the other end 6b of the second opening/closing lever 6 when the movable lens barrel 4 is at the maximum retracted position;
When the opening/closing lever 6 is rotated in the h direction, it is rotated in the j direction to close the barrier members 22, 23, and the second opening/closing lever 6 can be rotated in the j direction, so that the second opening/closing lever 6 can be rotated in the j direction by the biasing force of the spring 20. to open barrier members 22,23.

A gray code member 30 for detecting the closing of the lens barrier 7 and the position of the movable lens barrel 4 is disposed on the upper surface of the drive gear 9 described above. Figure 3 shows gray code member 3
0, 30a is a ground plate; 30a is a ground plate;
0b indicates three bit plates 0 Position A is the closed position of the lens barrier 7, position B is the maximum retracted position of the movable lens barrel 4, positions CG are the intermediate position of the movable lens barrel 4, and position H is the movable mirror The gray code member 30 indicating the maximum forward position of the trunk 4 is 1
By a fixed contact pin (not shown), the pin member l rotates to position C in the non-driving area 15b, whereby the gray code at position A is detected, and the pin member l rotates to the boundary position a between the driving area 15a and the non-driving area 15b. As a result, the gray code at position B is detected, and as it rotates toward the position in the drive area 15a, the gray code at position C-G is detected, and as it rotates to the position in the drive area 15a, the gray code at position H is detected. It is arranged so that

According to the above configuration, by driving the gear 11 with a motor, the pin member 1 moves in a circular motion via the drive gear 9. When the pin member l moves circularly in the drive region 15a of the drive groove 15, the lens barrel moving lever 2 rotates in the direction d as the pin member l rotates in the direction from the boundary position a to the position d, and the movable lens barrel 4 moves in the direction d. By moving forward and rotating in the direction from the position to the boundary position a, the lens barrel moving lever 2 rotates in the direction e, and the moving lens barrel 4
is retreating. When the pin member 1 comes to the boundary position fia, the movable lens barrel 4 becomes the maximum retreat position, and the pin member 1 moves to the drive groove 1.
5, the lens barrel moving lever 2 is not driven and the movable lens barrel 4 is stopped at the maximum retracted position. When the pin member l rotates in the direction from the boundary position a to the position C, the first opening/closing lever 5 rotates in the f direction, the second opening/closing lever 6 rotates in the h direction, and the j of the opening/closing ring 21 is rotated. The barrier members 22 and 23 are rotated in the direction.
is closed. Closing of the lens barrier 7 is recognized by the detection of the gray code at position IA of the gray code member 30,
The motor drive is stopped when the gray code at position A is detected.
Lens barrier 7 is maintained in a closed state. When the pin member l rotates in the direction from the position 1c toward the boundary position 11a, the first opening/closing lever 5 is rotated in the g direction by the spring 17, and the second opening/closing lever 6 and the opening/closing ring 21 are rotated by the biasing force of the spring 20. The barrier members 22 and 23 are opened by moving in the i direction and the i direction, respectively.

According to the above embodiment, since the gray code member 30 is used to detect the position of the movable lens barrel 4 and to detect the closing of the lens barrier 7, a switch means for detecting the closing of the lens barrier 7 is separately provided. It is not necessary, and benefits such as a reduction in the number of parts can be obtained.

[Effects of the Invention] As explained above, according to the present invention, the movable lens barrel is held in a stopped state within a predetermined circular motion range of the pin member, allowing only circular motion of the pin member, and the above-mentioned predetermined circular motion is Since the lens barrier is configured to open and close by the circular movement of the pin member within the range, the lens barrier can be opened and closed without making any additional movement of the movable lens barrel. It is possible to provide a lens barrier opening/closing mechanism suitable for compact cameras and the like where it is difficult to provide space for the camera.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing one embodiment of the present invention, and FIG.
A diagram showing the relationship between the lens barrel moving lever, the pin member, and the first opening/closing lever in the configuration shown in the figure, and FIG. 3 is a diagram showing an example of the gray hood member. 1... Pin member 2... Lens barrel moving lever 3...
Fixed barrel 4... Movable lens barrel 5, 6... Opening/closing lever 7... Lens barrier 15... Drive groove
30...Gray code

Claims (1)

[Claims] 1) a pin member that moves circularly by motor drive, and a lens barrel moving lever that has one end rotatably supported, the other end engages with the movable lens barrel, and moves the movable lens barrel forward and backward by its rotation; Converting the circular motion of the pin member into a rotational motion of the lens barrel moving lever, and holding the lens barrel moving lever in a stopped state within a predetermined circular motion range of the pin member so that only the circular motion of the pin member is controlled. A lens barrier opening/closing mechanism for a camera, comprising: a means for permitting the movement, and a means for opening and closing the lens barrier by circular movement of the pin member within the predetermined range of circular movement.