JPH0440194Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a camera with a lens barrier. Specifically, the lens barrier protects the photographing lens by covering the photographing optical path hole on the front plate of the camera. It's about cameras.

[Conventional technology]

Conventionally, as this type of camera with a lens barrier, the one described in Japanese Patent Application Laid-Open No. 167016/1983 is known.

In this method, a pin provided on the lens barrier engages with a cam groove, and as the pin moves along the cam groove, the lens barrier also moves, and the barrier aligns with the photographing optical path hole on the front plate of the camera. It is something to cover.

[Problem that the invention attempts to solve]

However, in the above system, the diameter of the pin is actually made slightly smaller than the width of the cam groove in order to prevent friction between the pin and the cam groove.
Therefore, when the pin moves along the cam groove, the lens barrier will shake slightly, and eventually a small gap will be created between the lens barrier and the area around the photographic optical path hole on the front surface of the camera. Something happened. As described above, this method has the disadvantage that the lens is not sufficiently dustproof.

The present invention solves the above-mentioned drawbacks, and the lens barrier completely contacts the area around the photographing optical path hole on the front panel of the camera, so there is no gap and dirt such as dirt does not enter the photographing lens. The object of the present invention is to obtain a camera with a lens barrier as described above.

[Means to solve the problem]

The structure of the present invention for achieving the above object will be explained using FIGS. 1 to 3 corresponding to the first embodiment. Then, it is further moved in the optical axis direction and fitted into the photographing optical path hole 2 of the front cover 1.

[Effect]

In this way, the barrier 7 is moved from the non-covering position to the covering position, further moved in the optical axis direction, and fitted into the photographing optical path hole 2 of the front cover 1.
It is in close contact with the optical path hole 2 and can reliably prevent entry of dust, dust, and other foreign matter.

[First Embodiment] A first embodiment of the present invention will be described based on FIG. 1. FIG. 1 is a perspective view showing a first embodiment of the present invention.

In FIG. 1, a lens barrel front cover 1 is provided with a photographing optical path hole 2. As shown in FIG. The shaft 3 passes through the front cover 1, and the shaft 3 extends along the optical axis direction of the photographic lens A. The bearing portion 4 pivotally supports the shaft 3. A central portion of the lever 5 penetrates through the shaft 3 so that the boomerang-shaped lever 5 consisting of an upper arm portion 5a and a lower arm portion 5b can rotate around the shaft 3 and move in the direction of the shaft 3. has been done. This lever 5 is made of an elastically deformable material such as a metal plate. Upper arm portion 5 of the lever 5
A pin 6 that extends along the optical axis direction to the opposite side to the front cover 1 side is protruded from the upper end of a. A disk portion 7 is provided at the lower end of the lower arm portion 5b of the lever 5 and is flush with the surface of the lower arm portion 5b.
The disk portion 7 functions as a lens barrier, and has a large diameter disk portion 7a slightly smaller than the diameter of the disk portion 7.
and a small-diameter disk portion 7b are integrated into a stepped disk shape. The diameter of the large-diameter disk portion 7a is slightly larger than the optical path hole 2, and the diameter of the small-diameter disk portion 7b is set to be slightly smaller than the optical path hole 2. A compression coil spring 8 is arranged between the bearing part 4 and the lever 5,
This spring 8 passes freely through the shaft 3 and biases the lever 5 in the optical axis direction. As disclosed in Figure 2,
A cam 10 is locally protruded from a peripheral portion 9 of the shaft 3 on the back surface of the lever 5 . This cam 10 is composed of a slope 10a that gradually slopes upward from a flat surface 9, and a continuous flat surface 10b that has the largest cam lift amount. It is located along the circumference of the center.

Returning to FIG. 1, a lens barrier drive plate 11 is fixed to the end of the shaft 3, and the drive plate 11 has a pin 12 extending toward the lever 5 along the optical axis direction and a bent portion 13. It is provided. The pin 12 is
The tip is set so that it can come into contact with the cam 10, and specifically, the radial distance from the shaft 3 to the pin 12 is set to be equal to the radial distance from the shaft 3 to the cam 10. A torsion coil spring 14 loosely passes through the shaft 3 and pin 12 between the drive plate 11 and the lever 5. Leg portions 14a and 14b extending linearly are formed at both ends of the torsion coil spring 14. One leg portion 14a is the bent portion 1
The lower edge of the pin 6 and the other foot 14b contact the upper portion of the circumferential surface of the pin 6, urging the pin 6 and the bent portion 13 to engage with each other.

An operation knob 15 is fixed to the tip of the shaft 3, and a first click groove 16a and a second click groove 16b are formed on the back surface thereof. A compression coil spring 1 is installed in the recess 17 provided on the front surface of the front cover 1.
One end of 8 is inserted. The coil spring 18
At the other end, a click ball 19 is pressed against the back surface of the knob 15 by the biasing force of the spring 18, and as the knob 15 rotates, the click ball 19 aligns with the positions of the click grooves 16a and 16b. At this time, the ball 19 engages with both the click grooves 16a and 16b. When the first click groove 16a engages with the ball 19, the lens barrier 8 is in the uncovered position (see the solid line in FIG. 1).
Both click grooves 16a and 16b are connected to the operating knob 15 so that the lens barrier 7 completely closes the optical path hole 2 when the second click groove 16b engages with the ball 19. They are positioned on the back side. The stopper pin 20 is connected to the lower arm portion 5b of the lever 5 when the lens barrier 7 reaches the position where it covers the optical path hole 2 due to the rotation of the lever 5, that is, the covering position (see the two-dot chain line in FIG. 1). The rotation of the lever 5 is restricted by coming into contact with the lever 5. The photographing lens A is spaced apart from the optical path hole 2 so that the lens barrier 7 can be moved between the photographing lens A and the optical path hole 2.

Next, the operation will be explained. First of all, lens barrier 7,
The closing operation for the optical path hole 2 will be described.

In FIG. 1, which shows the state when the lens barrier 7 is in the uncovered position, the pin 6 and the bent portion 1
3 is brought into contact with the biasing force of a torsion coil spring 14. Further, the tip of the pin 12 is pushed onto the flat surface 9 as shown in FIG. 2 by the biasing force of the coil spring 9.
is in contact with position P ₁ .

Then, the operation knob 15 is manually operated counterclockwise against the click force, and the drive plate 11 is rotated counterclockwise via the shaft 3. At this time, the bent portion 13 is connected to one foot portion 14a of the spring 14.
, the spring 14 is elastically deformed. Due to the restoring force generated by the elastic force, the other foot 14b also pushes down the pin 6, so the lever 5 also rotates counterclockwise. The lens barrier 7 thus moves from the uncovered position towards the coated position. At the same time as the lens barrier 7 reaches the covering position, the lower arm 5b of the lever 5 comes into contact with the pin 20, and the rotation of the lever 5 is stopped. However, at this time, the click ball 19 is not yet engaged with the second click groove 16b. Subsequently, when the knob 15 is further rotated counterclockwise, only the drive plate 11 is rotated counterclockwise, and the bent portion 13 resists the biasing force of the torsion coil spring 14 and separates from the pin 6, causing the torsion. The coil spring 14 is charged. As the drive plate 11 rotates, the pin 12 moves on the slope 10a of the cam 10 as shown in FIG.
presses and moves the lever 5 toward the front cover 1 along the optical axis direction against the compression coil spring 9. Along with this, the lens barrier 7 also moves toward the optical path hole 2 along the optical axis direction, and the lens barrier 7
The small diameter disc portion 7b fits into the optical path hole 2.
When the tip of the pin 12 comes into contact with position _P2 of the slope 10a as shown in FIG. 2, the ring-shaped end surface 7c of the large-diameter disk portion 7a is connected to the optical path within the inner surface of the cover as shown in FIG. It comes into contact with the periphery of the use hole 2. Thereafter, until the tip of the pin 12 reaches the flat surface 10b where the cam lift amount is large as shown in FIG.
This slight movement causes the lever 5 to be elastically deformed in the longitudinal direction, and this elastic deformation brings the end surface 7d into pressure contact with the periphery. . At the same time, the click ball 19 hits the second click groove 16b.
The rotation of the operation knob 15 is stopped. This completes the closing operation of the lens barrier 7 to the optical path hole 2. At this time, it is possible to ensure that there is no level difference between the surface of the lens barrier 7 and the surface of the front cover 1.

Next, the operation of opening the lens barrier 7 will be explained.

When the operating knob 15 is rotated clockwise against the click force, the drive plate 11 is also rotated clockwise.
As the drive plate 11 rotates, the tip of the pin 12 slides down toward the flat portion 9 along the slope 10a. As a result, the lever 5 is pushed by the restoring force of the coil spring 9 and is moved toward the drive plate 11 along the optical axis direction. Therefore, the lens barrier 7c comes out of the optical path hole 2. At this time, the pin 12 finishes sliding on the slope 10a and comes into contact with the flat portion 9 at position _P1 . Also, drive plate 1
The bent portion 13 of the lever 5 is brought into contact with the pin 6 of the lever 5. However, the click ball 19 is not yet engaged with the first click groove 16a. Subsequently,
When the operation knob 15 is rotated clockwise, the drive plate 1
1 rotation, the bending portion 13 pushes up the pin 6 of the lever 5. For this purpose, the lever 5 is also rotated clockwise, and the lens barrier 7 is moved from the covered position towards the uncovered position. When the click ball 19 engages with the first click groove 16a during clockwise rotation of the operating knob 15, the lens barrier 7 reaches the uncovered position and the rotation of the operating knob 15 is also stopped. This completes the opening operation of the lens barrier 7 from the optical path hole 2.

In the above first embodiment, parts 1, 2, 7,
With the exception of A, all other numbered parts are constructed as barrier drive means.

[Second Embodiment] A second embodiment of the present invention will be described based on FIGS. 4 and 5. 4 and 5 are schematic diagrams of the second embodiment, with FIG. 4 showing the lens barrier in an uncoated state, and FIG. 5 showing the lens barrier in a covered state.

In FIG. 4, a shaft 21 is positioned along the optical axis direction, and the tip of the shaft 21 is fixed to part 1 of the front cover. A lever 22 is provided at the end of the shaft 21.
is attached to be rotatable and movable in its axial direction, and this lever 22 has an upper arm portion 22a and a lower arm portion 22b. At the center of the lever 22, the shaft 21 is provided with a retaining portion 21a. A compression coil spring 23 is loosely passed through the shaft 21 between the part 1 of the front cover and the lever 22, and biases the lever 22. A large-diameter disk portion 24 is provided at the upper end of the upper arm portion 22a of the lever 22.
A stepped disc-shaped lens barrier 24 is provided, in which a lens barrier 24 and a small-diameter disc portion 24b are integrated. The surface of the lever 22 and the ring-shaped end surface 24c of the large-diameter disk portion 24a are formed as the same surface. A pin 25 is protruded from the lower end of the lower arm portion 22b of the lever 22 and extends toward the part 1 side of the front cover along the optical axis direction.

The shape of the drive member 26 is formed from a rectangular portion 28 including a protrusion 27 and an "L" shaped portion 29 that is vertically integrated with the protrusion 27. An inclined cam 30 serving as a first cam is formed at the upper left of the portion 28 so as to rotate the lever 22 by engaging with the pin 25 . An inclined cam 31a is provided at the upper left of the portion 29, and the inclined portion 31a serves as a second cam together with the flat portion 31b of the lower arm portion 22b of the lever 22.
The lens barrier 24 is formed to move in the optical axis direction by the engagement action with the lens barrier 24. Said part 2
An operation knob 32 is fixed to the front surface of the 8. A first click groove 33 and a second click groove 34 are formed at the lower edge of the portion 28. The click ball 35 is pushed by the click spring 36, and as the drive member 26 moves, the click ball 35 moves into both the click grooves 33, 34.
When the two click grooves 33,
34. When the first click groove 33 engages with the ball 35, the lens barrier 24
Both click grooves 33 and 34 are operated so that the lens barrier 24 completely closes the optical path hole 2 when the second click groove 34 engages with the ball 35. They are respectively positioned at the lower edges of the knobs 32. One end of the tension coil spring 37 is fixed to the upper arm portion 22a of the lever 22, and the other end is fixed to, for example, another member inside the camera, and urges the lever 22 in a counterclockwise direction.

Now I will explain the operation. First, lens barrier 24
Describe the closing operation of .

In FIG. 4, when the lens barrier 24 is located in the uncovered position, the pin 25 is in contact with the lower end 30a of the first inclined cam 30.

Then, when the driving member 26 is manually slid to the upper left in the figure using the operation knob 32, the pin 25 is pushed by the first inclined cam 30 and
0 up to the upper end 30b. Due to the engagement action, the lever 22 is rotated clockwise against the tension coil spring 37, and the lens barrier 24 is moved from the uncovered position toward the covered position. The pin 25 is located at the upper end 3 of the first inclined cam 30.
0b, as shown in FIG.
As soon as the lever 22 starts to come into contact with the lever 22, the rotation of the lever 22 is stopped. At this time, the lens barrier 24 is placed in the covering position. However, click ball 35
is not yet engaged with the second click groove 34. Subsequently, when the driving member 26 is moved to the upper left in accordance with the manual slide of the operating knob 32, the lower arm portion 22a is pushed by the second inclined cam 31a and slides down toward the lower end portion 31d of the cam 31a. . Due to the engagement action, the lever 22 is moved toward the part 1 side of the front cover along the optical axis direction against the coil spring 23, and the small diameter disc part 24b of the lens barrier 24 is fitted into the optical path hole 2. do. As shown in FIG. 6, the lower arm portion 22b is connected to the cam 3.
When the ring-shaped end surface 24c of the large-diameter disk portion 24a comes into contact with the position _P3 immediately in front of the lower end portion 31d of the large-diameter disk portion 24a,
contacts the peripheral protrusion 2a of the optical path hole 2 on the inner surface of the front cover 1. Thereafter, when the lower arm portion 22b further passes through the lower end portion 31d of the cam 31a and comes into contact with the flat portion 31b, the lever 22
is slightly moved in the direction of arrow C in the figure by the lower arm portion 22b. This slight movement of the lever 22 causes the lever 22 to be elastically deformed in the longitudinal direction, and this elastic deformation brings the end surface 24c into pressure contact with the peripheral protrusion 2a. At the same time, the click ball 35 in Fig. 5 (or Fig. 4) moves to the second position.
By engaging with the click groove 34, the manual slide of the operating knob 32 is locked. This completes the closing operation of the lens barrier 24 to the optical path hole.

Next, the operation of opening the lens barrier 24 from the optical path hole 2 will be explained.

When the operation knob 32 is manually slid to the lower right, the driving member 26 is also moved to the lower right against the click force. Therefore, due to the restoring force of the spring 23, the lower arm portion 22b climbs up from the flat portion 31b toward the upper end portion 31c through the lower end portion 31d of the second inclined cam 31a, and the lever 2
2 is also retreated along the optical axis direction. Accordingly, the lens barrier 24 comes out of the optical path hole 2. Subsequently, when the drive member 26 is moved to the lower right in accordance with the manual slide of the operation knob 32, the restoring force of the tension coil spring 37 causes the pin 25 to move downward.
slides down along the first inclined cam 30 from the upper end 30b of the cam 30 to the lower end 30a. Accordingly, the lever 22 is also rotated counterclockwise.
To this end, the lens barrier 26 is moved from the covered position to the uncovered position. At this time, the lower arm portion 23 separates from the upper end portion 31c of the second inclined cam 31a. When the click ball 35 engages with the first click groove 33 as shown in FIG. 1, the movement of the drive member 26 is stopped. At this time, the pin 25 is connected to the cam 30.
When the lever 22 reaches the lower end 30a, the lever 22 will not rotate any further due to the spring 37 to stop the driving member 26 from sliding. Further, the lens barrier 24 is located in an uncovered position. This completes the opening operation of the lens barrier 24 from the optical path hole 2.

In the second embodiment described above, except for the part 1 of the front cover, the photographing optical path hole 2, and the lens barrier 24, all the parts with other symbols are configured as barrier driving means.

[Effect of idea]

According to the present invention, the barrier is moved from an uncovered position where it does not cover the optical path hole to a covered position where it covers the optical path hole, and the barrier is moved in the optical axis direction to force the optical path. In order to fit into the optical path hole, it comes with a lens barrier that allows it to fit tightly into the optical path hole, eliminating gaps like conventional ones and preventing dust, dirt, and other foreign matter from entering the camera. You can get a camera.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a first embodiment of the present invention.
FIG. 2 is an enlarged perspective view for briefly explaining the shape of the cam 10 in FIG. 1. FIG. 3 is a sectional view showing the state when the lens barrier 7 in FIG. 1 is in pressure contact with the optical path hole 2 and the surroundings thereof. Fourth
This figure is a perspective view of a second embodiment of the present invention, showing a state in which the lens barrier 24 is located in an uncovered position. FIG. 5 is a perspective view showing the lens barrier 24 in FIG. 4 in the covering position. FIG. 6 shows the state when the lens barrier 24 in FIG. 4 is in pressure contact with the optical path hole 2, and
It is a sectional view showing the state with the surroundings. Explanation of the symbols of the main parts, 5, 22...Lever,
7, 24... Lens barrier, 10... Cam, 28
...Driving member.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A front cover of the lens barrel disposed in front of the photographic lens and having a hole for the photographing optical path; a covered position that covers the optical path hole and an uncovered position that does not cover the optical path hole; In a camera with a lens barrier, the barrier is moved from the non-covered position to the covered position, and further moved in the optical axis direction and fitted into the photographing optical path hole of the cover. A camera with a lens barrier, characterized in that it is provided with a barrier driving means for causing the lens barrier to move. (2) The barrier is formed as a stepped disc that integrates a large-diameter disc part and a small-diameter disc part, and the optical path hole is slightly smaller than the large diameter and smaller than the small diameter. The driving means is configured to fit the small diameter disc part of the stepped disc into the optical path hole and urge the large diameter disc part to come into pressure contact with the optical path hole. A camera with a lens barrier as claimed in claim 1 of the utility model registration claim.