JPH0542429Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a shutter device provided in an optical system.

2. Description of the Related Art A shutter device is provided, for example, in the optical system of a slit exposure scanning type copying machine. This type of shutter device is installed in the optical path to remove necessary light because it is necessary to prevent the photosensitive drum from being exposed to light when the scanning mirror returns.

A conventional shutter device has a structure shown in FIG. 6, for example. Shutter blades 1 and 2 are attached to rotating shafts 3 and 4, respectively. The shutter blades 1 and 2 are connected to one end of interlocking plates 5 and 6, respectively. The other ends of the interlocking plates 5 and 6 are connected to a shaft 9 of a solenoid 8. Further, a spring 7 is attached to a connecting portion between the interlocking plates 5, 6 and the shaft 9.

When the shaft 9 of the solenoid 8 moves in the direction of the arrow Z in FIG. 6 against the force of the spring 7, the shutter blades 1 and 2 rotate in the directions of the arrows X and Y, respectively. This closes the shutter blades 1 and 2 and blocks light.

Problems that the invention aims to solve However, in this conventional shutter device, the 6th
As shown in the figure, when the shutter blades 1 and 2 were closed, the respective tips of the shutter blades 1 and 2 abutted against each other, making it impossible to tighten them.

Therefore, an attempt was made to prevent the tips of the shutter blades 1 and 2 from coming into contact with each other by forming the tips of the shutter blades 1 and 2 to have an L-shaped cross section, respectively, as shown in FIG. Alternatively, as shown in FIG. 8, an attempt has been made to shift the positions of the rotating shafts 3 and 4 of the shutter blades 1 and 2 so that the tips of the shutter blades 1 and 2 do not touch each other.

However, in the conventional example shown in FIG. 7, a gap D1 is formed when the shutter blades 1 and 2 are closed. Furthermore, in the conventional example shown in Fig. 8, the gap D
2 will be formed. Therefore, in either case, the light shielding would be incomplete and it could not be used in practice.

Purpose of the invention This invention was made in order to solve the above-mentioned problems, and to provide a shutter device that can reliably open and close without the multiple shutter members colliding with each other, and that can reliably block light without forming any gaps when closed. The purpose is to provide.

Summary of the Invention Therefore, the gist of this invention is a shutter device that is set in an optical system and has a plurality of shutter members and a drive source, with an interlocking member connected between each shutter member and the drive source, so that each shutter member can be rotated in the opposite direction by the drive source to close and block light, wherein each of the interlocking members has a different length, and the short interlocking member is provided with an extension mechanism for extending the length of the short interlocking member when the shutter member connected to the short interlocking member closes and stops rotating, thereby staggering the timing of rotation of each shutter member.

Means for solving the problem Please refer to Figure 1. The shutter device is set to an optical system. The shutter device includes a first shutter member 10, a second shutter member 11, and a drive source (a solenoid 19 in the embodiment).
A first interlocking member 21 is connected between the first shutter member 10 and the shaft 20 of the solenoid 19. In addition, the second shutter member 11 and the shaft 2
A second interlocking member 14 is connected between the two.
The solenoid 19 rotates the first shutter member 10 and the second shutter member 11 in opposite directions to close them and thereby shield light.

The first interlocking member 21 and the second interlocking member 14 have different lengths. Shorter first interlocking member 21
is equipped with an extension mechanism 40 for extending the length of the first interlocking member 21 when the first shutter member 10 closes and stops rotating.

Effect Please refer to FIGS. 3 to 5.

In FIG. 3, the first shutter member 10 and the second
Shutter member 11 is open.

As shown in FIG. 4, when the shaft 20 of the solenoid 19 moves in the direction of arrow Z, the first shutter member 10 on the shorter first interlocking member 21 side rotates in the direction of arrow X before the second shutter member 11.
Thereafter, the second shutter member 11 rotates in the direction of arrow Y. This prevents the tip of the first shutter member 10 and the tip of the second shutter member 11 from coming into contact with each other.

As shown in FIG. 5, when the rotation of the first shutter member 10 stops, as the shaft 20 further moves in the direction of arrow Z, the extension mechanism 40
Due to the action, the length of the first interlocking member 21 changes from L1.
Extends to L3. As a result, the first interlocking member 21
The length L3 of the second shutter member 11 is almost the same as the length L2 of the second interlocking member 14, and the second shutter member 11 can be closed, which has a shorter length L1 than that of the first interlocking member 21.

Example Please refer to FIGS. 1 and 2.

The shutter device of this invention is installed, for example, in the optical system of a slit exposure scanning type copying machine.

The shutter device comprises a first shutter member 10 and a second shutter member 11. The first shutter member 10 can rotate in the direction of the arrow X around the shutter shaft 12. The second shutter member 11 can rotate in the direction of the arrow Y around the shutter shaft 13. The first shutter member 10 and the second shutter member 11 are parallel to each other in the open state as shown in FIG. 1. The shutter shafts 12 and 13 are oriented in a direction perpendicular to the optical axis of the optical system. A stopper 36 is provided at approximately the midpoint between the shutter shaft 12 and the shutter shaft 13.

The second shutter member 11 has a second interlocking member 14.
One end 15 of the two is connected via a pin 16.
The other end 17 of this second interlocking member 14 is connected to the spring hook 1
8 to the tip of the shaft 20 of the solenoid 19.

The first interlocking member 21 has elements 22 and 23 and a spring 24. One end 25 of the element 22 is connected to the first shutter member 10 via a pin 26. The other end 2 of the element 22
7 is provided with a pin 28. A spring 24 is provided between this pin 28 and the spring hook 18.

A female thread 30 is formed at one end 29 of the element 23 . Further, a male thread 31 attached to this female thread 30 is passed through a guide hole 33 formed in the element 22. This guide hole 33 has an elongated hole shape. A circular part 32 is attached to the male thread 31.
is formed. The diameter of this circular portion 32 is larger than the width of the guide hole 33.

Therefore, element 23 is element 2
2 along the guide hole 33 in the longitudinal direction.

A spring 3 is inserted between the spring hook 18 and the spring hook 35.
4 is provided. This spring 34 has a function of returning the shaft 20 of the solenoid 19 in the direction opposite to the arrow Z direction when the solenoid 19 is not energized.

the stopper 36, the shutter shaft 12,
13, first interlocking member 21, second interlocking member 14, spring hooks 18, 35, solenoid 26, spring 34
is set at a position that does not obstruct the optical path. Further, a stopper 36, shutter shafts 12, 13, solenoid 26, and spring hooks 18, 35 are attached to the frame (not shown) of the copying machine.

Next, the operation of the above-mentioned shutter device will be explained based on FIGS. 3 to 5.

First, refer to FIG. In FIG. 3, the first shutter member 10 and the second shutter member 11 are in a completely opened state. In this state, the length L1 of the first interlocking member 21 is smaller than the length L2 of the second interlocking member 14. The first shutter member 10 and the second shutter member 11 are parallel to each other,
In this embodiment, it is parallel to the optical path of the optical system. Further, the direction of arrow Z of the shaft 20 is parallel to the optical path. Furthermore, the shaft 20 of the solenoid 19 is in a state of being extended in the direction opposite to the arrow Z. Springs 34 and 24 are in a compressed state.

When the solenoid 19 is energized, the solenoid 19
When the shaft 20 starts moving in the direction of arrow Z against the force of the spring 34, the first shutter member 10 is shorter than the second shutter member 11 because the first interlocking member 21 is shorter than the second interlocking member 14. Arrow X ahead
Rotate in the direction. Then the second shutter member 1
1 rotates in the direction of arrow Y. In other words, the state shown in FIG. 4 is reached.

In this state, the length of the first interlocking member 21 is
It is L1. When the shaft 20 further moves in the direction of arrow Z against the force of the spring 34, the state shown in FIG. 5 is reached. That is, the first shutter member 10 hits the stopper 36 and stops rotating. At this time, the first shutter member 10 and the second shutter member 1
1, the second shutter member 11 has not yet overlapped the tip of the first shutter member 10 because there is a difference in rotation timing. Therefore, the shaft 20 further moves in the direction of arrow Z.

This movement causes the spring 24 of the extension mechanism 40 to extend and the element 23 to move relative to the element 22. As a result, the first interlocking member 21
The length extends to L3. When the male screw 31 moves from one end of the guide hole 33 to the other end and stops at the other end, the length of the first interlocking member 21 extends from L1 to L3.

Utilizing this length extension, the amount of movement of the shaft 20 in the direction of arrow Z is further obtained, and the length L3 of the first interlocking member 21 and the length L2 of the second interlocking member 14 are
to be almost the same. Due to this amount of movement, the tip of the second shutter member 11 comes into close contact with the tip of the first shutter member 10, overlapping it and completely closing it. This completely blocks light.

Next, when opening the first shutter member 10 and the second shutter member 11, the solenoid 1
9 is de-energized, and the force of the springs 24 and 34 moves the shaft 20 in the state shown in FIG. 5 in the direction opposite to the direction of arrow Z. First, in the first interlocking member 21, the spring 24 contracts and the element 23
2, the second shutter member 11 first begins to open in the direction opposite to the direction of arrow Y. Therefore, from the length L3 of the first interlocking member 21
Shrink to L1.

When the shaft 20 further moves in the direction opposite to the direction of arrow Z, the state shown in FIG. 4 is reached. That is, the second
After the shutter member 11 rotates, the second shutter member 10 also rotates to be in a half-open state. Also at this time, the tip of the first shutter member 10 and the tip of the second shutter member 11 do not come into contact with each other.

When the shaft 20 further moves in the direction opposite to the direction of arrow Z, the state shown in FIG. 3 is reached. The first shutter member 10 and the second shutter member 11 become parallel to the optical path and do not block the optical path.

However, this invention is not limited to the above embodiment. The driving source is not limited to the solenoid 19. Further, the direction of the shutter shaft does not necessarily have to be perpendicular to the optical path.

Effects of the invention As is clear from the above explanation, multiple shutter members can be opened and closed reliably and smoothly without colliding with each other by eliminating mutual interference, and when closed, the gaps between the shutter members are eliminated and light is completely blocked. can.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a preferred embodiment of the shutter device of this invention, Fig. 2 is an exploded perspective view showing the first interlocking member, and Fig. 3 is a state in which the first shutter member and the second shutter member are opened. Figure 4 showing
The figure shows a state where the first shutter member and the second shutter member are partially closed, FIG. 5 shows a state where the first shutter member and the second shutter member are completely closed, and FIGS. 6 to 8 The figure shows a conventional shutter device. 10...First shutter member, 11...Second shutter member, 14...Second interlocking member, 19...
Solenoid, 20... Shaft, 21... First interlocking member, 40... Extension mechanism.

Claims (1)

[Scope of utility model registration request] It is set in the optical system and has a plurality of shutter members and a drive source, and an interlocking member is connected between each shutter member and the drive source, and the drive source rotates each shutter member in the opposite direction to close it. In the shutter device, the interlocking members have different lengths, and when the shutter member connected to the short interlocking member closes and stops rotating, the length of the short interlocking member is extended. 1. A shutter device characterized in that the extension mechanism is provided in a short interlocking member, and the timing of rotation of each shutter member is staggered.