JPS6057571B2 - Mirror support structure in movable mirror device - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is used in optical information recording and reproducing devices such as optical video disc players, and is applicable to movable mirror devices that reflect laser light, etc. in a predetermined optical axis direction. Related to mirror support structure.

[Conventional technology]

In the conventional movable mirror device shown in FIGS. 7 to 11,
1 is a mounting base for attaching the movable mirror device to the main body (not shown);
Reference numeral 2 denotes a base that is adjustably attached to the mount 1 via screws 11 and 12.

The screws 11 and 12 pass through the mount 1 and are screwed to the base 2.

3 is a mirror adhered to a permanent magnet 4, and 5 is a rubber member having a support rod 6 at its end.

7 is a support member fixed to the base 2.

8 is a coil whose lead wires are connected to terminals 15 and 16.
It is connected to the.

Numerals 9 and 10 are screws that are screwed together with the mounting base 1 and press the base 2.

13 and 14 are screwed to the base 2, and can be rotated back and forth appropriately to change the contact position with the rubber member 5.

17 is screwed to the base 2, and the support rod 6 can be fixed to the base 2.

To explain its operation, when a current flows from the terminals 15 and 16, the current flows through the coil 8, and the resulting magnetic field influences the permanent magnet 4, and the mirror 3 moves in the direction of the arrow shown in FIG. Rotates around 7 as a fulcrum.

Therefore, the laser beam etc. should be controlled at a specified level. It can be reflected in any direction. Here, the reference position of the mirror 3 is adjusted by screws 9 and 10 in the vertical (elevation angle or depression angle) direction, and by screws 11 and 12 in the horizontal direction. screw 1
3 and 14 are used for adjusting the rotation limit of the mirror 3. However, in such a device, in order to set the reference position of the mirror 3, it was necessary to adjust the four screws 9 to 12, and the adjustment was difficult. [Summary of the Invention] It is an object of the present invention to eliminate such drawbacks and provide a mirror support structure in a movable mirror device that is easy to adjust.

Another object of the present invention is to provide a mirror support structure in a movable mirror device in which a movable part including a mirror can be attached to a base with a simple configuration. The mirror support structure according to the present invention includes a movable part including a mirror part on one surface of which is formed with a reflective surface that reflects a light beam, and an axis that abuts one surface of the movable part and connects the tips of the mirror parts. The angle of elevation or depression of the movable part is adjusted by defining the rotation axis of the movable part and moving forward or backward rotation of at least one of the parts.
a pair of threaded parts that can be adjusted; and an elastic material that is located approximately midway between the pair of threaded parts, has one end fixed to the other surface of the movable part, and elastically biases the movable part against the pair of threaded parts. and a base to which the pair of threaded parts and the other end of the core are fixed.

Further, the mirror support structure according to the present invention includes a movable part including a mirror part in which a coil formed in an annular shape is disposed around the mirror part and a reflective surface for reflecting a light beam is formed on one surface, and a movable part that abuts one surface of the movable part. a first pair of threaded parts that define a rotational axis of the movable part by an axis connecting the tip end of the screw part; The movable part is located approximately midway between the second pair of threaded parts and the first pair of threaded parts, one end of which is fixed to the other surface of the movable part, and the movable part is elastically attached to the pair of threaded parts. It is characterized by having a core made of an elastic material that provides elasticity, and a base to which the first and second pair of threaded parts and the other end of the core are fixed.

[Embodiments] A movable mirror device including an embodiment of the present invention will be explained below.

The movable mirror device basically includes a base 1, a permanent magnet section 2, a yoke 3, a plate 29, and a movable section 4.

At the rear of the base 1, a permanent magnet part 2 is magnetized with one end being magnetized to an N pole and the other end being magnetized to an S pole, and a pair of yokes 3 are fixed in contact with both ends of the permanent magnet part 2 in between. The movable part 4 includes a mirror part 6 adhered to a mirror substrate 22 made of aluminum or the like with double-sided tape or the like, an annular plate 21 made of aluminum or the like wrapped in a ring around the mirror substrate 22, and a mirror part 6 attached to the annular plate 21. A wound coil portion 7, a core portion 12 made of an elastic material such as rubber whose one end is fixed to the back surface of the mirror substrate 22, and a core portion 12 such as aluminum fixed to the core portion 12 near the free end of the core portion 12. The locking portion 11 is comprised of a locking portion 11 made of The plane 33 of the core 12 is
It does not cover the entire back surface of the mirror substrate 22, but is formed so that the back surface 28 of the mirror substrate 22 is exposed. A conical recess 26 and a V-shaped long groove 27 are formed on the plane 33, and a hill-shaped protrusion, that is, a trapezoidal protrusion 25, is provided at the center. A groove 18 is formed in the left and right rear portions of the base 1, and the terminal 5 is inserted into the predetermined hole, and the collar 20, which is integrally formed with the terminal 5, is inserted along the groove 18 at the position where it contacts the base 1. Terminal 5 is bent.

A lead wire 8 of the coil portion 7 is electrically connected to the terminal 5. A plate 29 is bonded to the base 1, and serves as a path for magnetic flux that travels from the permanent magnet portion 2, which is magnetized in the direction of the surface in contact with the yoke 3, through the yoke 3. hole 9
has a screw 13 screwed together with the base 1, and by adjusting the screw 13, the screw 13 is inserted into the hole 31 and comes into contact with the locking part 11, thereby locking the movable part 4 in a predetermined position. can.

The screws 17 are fixed to the base 1, but the screws 14 to 1
6 is screwed to the base 1 and can be moved back and forth by rotating. The tip of the screw 14 is V
The tip of the screw 17 is fitted into the long groove 27, and the tip of the screw 17 is fitted into the conical recess 26, and together they determine the pivot point of the movable part 4. The tips of the screws 15 and 16 come into contact with the back surface 28 of the mirror substrate 22 to limit the rotation limit of the movable part 4. When a current is passed from the terminal 5 to the coil portion 7 via the lead wire 8, the screw 14 is
, 17, the ■-shaped long groove 27, and the two receiving parts of the conical recess 26. The movable part 4 rotates in the direction of the arrow in FIG. .

As a result, the optical axis direction of the beam reflected by the mirror portion can be changed in a predetermined direction. The rotation limit is determined by adjusting the screws 15 and 16 and moving them back and forth to change the position in contact with the plane 28 of the mirror substrate.
The movable portion is biased by the screws 13 and 14 so that when the current stops flowing through the coil portion 7, the movable portion 4 is returned to its original position due to the elasticity of the core portion 12. [Effect] In the mirror mounting structure of the movable mirror device according to the present invention, the influence of external magnetic fields can be almost ignored, so there is no need to adjust the left-right (horizontal) position of the mirror part, and the vertical position Since only two position adjustment screws 14 and 17 are required, adjustment is easy.

Since one of the screws 17 is fixed on the first base, adjustment can be made with just one screw. Further, since the adjustment screws 14 and 17 are used as rotational fulcrums, there is no need to provide a rotational fulcrum separately from the adjustment screws. Furthermore, screws 15,1
By moving the movable part 6 forward and backward, the position in contact with the back surface of the mirror substrate 22 can be changed, so the rotation limit of the movable part can be easily adjusted. In addition, the movable part 4 including the mirror part 6 is made of an elastic material so that the screws 14, 1
Since the mirror part 6 is elastically biased by the mirror part 7, it is possible to support the mirror part 6 with respect to the base 1 with a simple structure.

[Brief explanation of the drawing]

1 to 6 show a front view, a right side view, a bottom view, a top view, a rear view, and a longitudinal cross-sectional view of the center of the front view, respectively, of a movable mirror device including an embodiment of the present invention.

Claims (1)

[Scope of Claims] 1. A mirror support structure in a movable mirror device, which includes a movable part including a mirror part on one surface of which a reflective surface that reflects a light beam is formed, and a tip end of each movable part that comes into contact with one surface of the movable part. a pair of threaded parts that define a rotational axis of the mirror part by an axis connecting the two parts, and that can adjust the angle of elevation or depression of the movable part by rotating forward or backward at least one of the parts; a core portion made of an elastic material located approximately in the middle of the movable portion and having one end fixed to the other surface of the movable portion and elastically biasing the movable portion toward the pair of screw portions, the pair of screw portions and the core portion; 1. A mirror support structure in a movable mirror device, comprising a base to which the other end of the part is fixed. 2. Claims characterized in that one of the pair of threaded parts is fixed to the base so that it cannot move back and forth, and the elevation angle or depression angle of the movable part is adjusted only by the other threaded part. A mirror support structure in the movable mirror device according to item 1. 3. The core part extends in the axial direction on the other surface of the mirror part, and a pair of screw receiving recesses are formed at positions corresponding to the pair of screw parts. A mirror support structure in a movable mirror device according to scope 1 or 2. 4. The mirror support structure in a movable mirror device according to claim 3, wherein at least one of the pair of screw receiving recesses is formed in a V-shaped long groove. 5. A mirror support structure in a movable mirror according to claims 1 to 4, wherein the core portion has a hill-shaped projection at the end thereof that is fixed to the other end of the movable portion. . 6. A mirror support structure in a movable mirror device, which includes a movable part including a mirror portion around which a coil formed in an annular shape is formed and a reflective surface for reflecting a light beam formed on one surface, and a movable part that corresponds to one surface of the movable part. a first pair of screw portions that define a rotation axis of the movable portion by an axis line that connects the tip portions of the first screw portions;
a second pair of threaded parts arranged in a direction perpendicular to the rotational axis and regulating the rotation limit of the movable part; and a second pair of threaded parts located approximately in the middle of the first pair of threaded parts, one end of which is arranged in a direction perpendicular to the rotational axis and which limits the rotational limit of the movable part; a core made of an elastic material that is fixed to the other surface of the part and elastically urges the movable part toward the pair of threaded parts; the first and second threaded parts and the other end of the core; A mirror support structure characterized by having a base to which is fixed.