JP4656678B2 - Optical element bonding device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an adhesive device for attaching an optical element to a base or the like of an optical disk device.
[0002]
[Prior art]
FIG. 9 shows an example of a conventional optical element bonding apparatus. Here, it is assumed that the optical element 520 is bonded to a seating surface 510 provided on the base 500 of the optical disc apparatus. The conventional bonding apparatus includes a gantry 550 on which the base 500 is placed and a holder 560 that holds the optical element 520. The holder 560 is moved toward the mount 550 (in the direction of the arrow in the figure) by the lifting mechanism 570 and the optical element 520 held by the holder 560 is pressed against the seat surface 510.
[0003]
An adhesive is applied to the seating surface 510 in advance. When the elevating mechanism 570 is driven to press the optical element 520 against the seating surface 510, the adhesive is pressurized between the adhesive surface (lower surface) of the optical element 520 and the seating surface 510. When this adhesive is irradiated with ultraviolet rays, the adhesive is cured and the optical element 520 is bonded to the seating surface 510.
[0004]
[Problems to be solved by the invention]
Here, if the adhesive layer between the optical element 520 and the seating surface 510 is thick, the optical element 520 is displaced due to the expansion and contraction of the adhesive layer due to temperature change. It is known to be desirable. However, if the amount of the adhesive applied to the seating surface 510 is reduced, there may be a portion where no adhesive is present between the optical element 520 and the seating surface 510 due to uneven application of the adhesive or the like. There was a problem that 520 could not be securely fixed to the seating surface 510.
[0005]
In view of the circumstances as described above, an object of the present invention is to thin an adhesive layer for bonding an optical element to a seating surface.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problems, an optical element bonding apparatus according to the present invention includes (1) a support unit that supports a component having a predetermined seating surface, (2) a holding unit that holds the optical element, and (3) A moving means for moving the holding portion relative to the seating surface so that the optical element is in close contact with the seating surface; Rotating means for rotating the holding portion so as to rub against each other.
[0007]
In this manner, the adhesive layer between the optical element and the seating surface can be made thin and uniform by rubbing the optical element and the seating surface with the optical element being in close contact with the seating surface. Therefore, it is possible to make the adhesive layer thin while securely fixing the optical element to the unit base.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a plan view showing a schematic configuration of an optical disc apparatus according to an embodiment, and FIG. 2 is a schematic view showing an optical system of the optical disc apparatus. As shown in FIGS. 1 and 2, the optical disc apparatus is fixed to a movable portion 3 equipped with an objective lens 10 for converging a laser beam onto the recording surface of the optical disc 2 and a main body (not shown) of the optical disc apparatus. The optical unit 6 is used.
[0009]
As shown in FIG. 1, the movable portion 3 is guided in a straight line horizontally by a pair of center yokes 41 and 42 fixed to an optical disc apparatus main body (not shown). U-shaped side yokes 43 and 44 are attached to both ends of the center yokes 41 and 42, respectively. Magnets 45 and 46 are fixed to the side yokes 43 and 44 on the center yoke side.
[0010]
The movable portion 3 is provided with a pair of driving coils 47 and 48 that face the aforementioned magnets 45 and 46. When a current is passed through the drive coils 47 and 48, the movable portion 3 moves straight in the left-right direction in the figure by the action of the magnetic field formed by the magnets 45 and 46.
[0011]
As shown in FIG. 2, the fixed optical unit 6 is provided with a light source module 7. The light source module 7 includes a semiconductor laser 18 that emits a laser beam, a collimator lens 20 that converts divergent light (from the semiconductor laser 18) into parallel light, a composite prism assay 21, an imaging lens 23, a data detection / focus / tracking detection sensor. 24, and an APC sensor 25.
[0012]
The cross-sectional shape of the parallel light beam emitted from the collimating lens 20 is oblong due to the characteristics of the semiconductor laser 18, and it is inconvenient to narrow the laser light beam finely on the optical disk 2, so it is necessary to convert it into a substantially circular cross-section. is there. Therefore, the incident surface 21a of the composite prism assay 21 has a predetermined inclination with respect to the incident optical axis, and the cross-sectional shape of the parallel light beam is shaped from an oval shape to a substantially circular shape by refracting the incident light. .
[0013]
The laser beam emitted from the light source module 7 of the fixed optical unit 6 goes straight through the space and enters the movable portion 3. The laser beam guided to the movable unit 3 is reflected upward by the deflection mirror 31 and enters the objective lens 10.
[0014]
FIG. 3 shows the relationship between the objective lens 10 and the optical disc 2. The laser beam incident on the objective lens 10 passes through the protective layer 2B of the optical disc 2 and converges on the recording surface 2A. Note that the objective lens 10 mounted on the movable part 3 is controlled to move up and down so as to follow the surface shake of the optical disk 2 in order to keep the distance between the movable part 3 and the recording surface 2A of the optical disk 2 constant. Description of the movement control method of the objective lens 10 called focus servo will be omitted.
[0015]
The return laser beam reflected and returned from the optical disk 2 travels in the opposite direction to the forward path, returns to the fixed optical unit 6, and enters the composite prism assay 21. The half mirror surface 21b of the composite prism assay 21 generates transmitted light and reflected light toward the data detection / focus / tracking detection sensor 24, and separates the laser beam on the return path. The data detection / focus / tracking detection sensor 24 is a composite sensor that reads data information recorded on the optical disc 2 and outputs a data signal, and outputs a focus / tracking error signal. More precisely, the focus / tracking error signal and the data signal are generated by a head amplifier circuit (not shown) and sent to a control circuit or an information processing circuit.
[0016]
Next, an apparatus for bonding the optical element 200 to the unit base of the fixed optical unit 6 will be described. Here, the optical element 200 may be any of the composite prism assay 21 and the collimating lens 20 (FIG. 2) described above.
[0017]
FIG. 4 is a side view of the bonding apparatus 100. The bonding apparatus 100 has a gantry 111 arranged horizontally. The gantry 111 is provided with a plurality of support seats 112 for mounting a unit base (hereinafter simply referred to as a unit base 300) of the fixed optical unit 6 (FIG. 2). The unit base 300 is placed on the seat 112 of the gantry 111 so that the seat surface 301 is horizontal.
[0018]
The holder 121 that holds the optical element 200 such as a prism is configured to suck and hold the optical element 200 using vacuum suction. The holder 121 is attached to the lower end of the slide shaft 123 extending in the vertical direction. The slide shaft 123 is inserted into the guide tube 141, is supported to be slidable in the axial direction (that is, the vertical direction), and is supported to be rotatable about the axis.
[0019]
A coil spring 122 that is a compression spring is provided between the guide tube 141 and the holder 121. The coil spring 122 biases the holder 121 and the slide shaft 123 toward the base 300. That is, when the guide tube 141 is moved in the vertical direction by a moving device 144 described later, the holder 121 and the slide shaft 123 are moved in the vertical direction via the coil spring 122. A stopper ring 124 is provided in the vicinity of the upper end of the slide shaft 123 so that the stopper ring 124 contacts the guide tube 141 when the slide shaft 123 moves to a predetermined position.
[0020]
The moving device 144 includes a guide rail 144a fixed to the vertical support portion 151 and a movable portion 144b that can move up and down along the guide rail 144a. The above-described guide tube 141 is attached to the movable portion 144b via a fixed base 142 and a connecting member 143. Although not described in detail, the moving device 144 is configured to move the movable portion 144b using a ball screw or a linear motor. Moreover, the vertical support part 151 is erected on the mount 111 (FIG. 4).
[0021]
FIG. 5 is a plan view of the bonding apparatus 100. In order to rotate the slide shaft 123 about its axis, one end of an arm 131 extending perpendicular to the axial direction is fixed to the top of the slide shaft 123. The other end of the arm 131 is attached to the plunger 135 of the air cylinder 133 via the transmission pin 132 and the transmission member 136. Air from an air source (not shown) is supplied to the air cylinder 133, and the plunger 135 reciprocates in a direction substantially orthogonal to the longitudinal direction (rotating radial direction) of the arm 131. The reciprocating motion of the plunger 135 is converted into the rotational motion of the arm 131.
[0022]
The arm 131 moves up and down (with the slide shaft 123), whereas the air cylinder 133 does not move up and down. Therefore, the transmission pin 132 has a length that covers the vertical movement range of the arm 131, and is configured so that the arm 131 can slide along the transmission pin 132. Thereby, the connection between the arm 131 and the plunger 135 of the air cylinder 133 is maintained regardless of the vertical position of the arm 131.
[0023]
Further, while the plunger 135 moves linearly, the movement of the transmission pin 132 becomes a circular motion around the rotation center of the arm 131. However, since the distance of the linear motion of the plunger 135 is shorter than the radius of the circular motion of the transmission pin 132, there is a certain amount of clearance between the transmission pin 132 and the insertion hole 131a (through the transmission pin 132) of the arm 131. I just need it.
[0024]
With this configuration, the bonding apparatus 100 moves the optical element 200 held by the holder 121 in a direction perpendicular to the seating surface 301 and moves the optical element 200 around an axis perpendicular to the seating surface 301. Can be rotated.
[0025]
Next, a bonding operation using the bonding apparatus 100 will be described with reference to FIGS. 6, 7, and 8. In FIG. 6, the slide shaft 123 is at the upper limit position of the movement range. The unit base 300 is placed on the gantry 111, and the optical element 200 is vacuum-sucked on the holder 121. Note that an adhesive is applied to the seat surface 301 of the unit base 300 in advance.
[0026]
FIG. 7 shows a state where the moving device 144 is operated to move the slide shaft 123 and the holder 121 downward, and the optical element 200 held by the holder 121 is brought into contact with the seating surface 301 of the unit base 300. In this state, the coil spring 22 has a natural length L0. That is, the optical element 200 has not yet been pressed against the seating surface 301.
[0027]
FIG. 8 shows a state where the moving device 144 is further operated and the guide tube 141 is lowered by the distance D from the state of FIG. The coil spring 22 is compressed from a natural length L0 to L1, and the optical element 200 is pressed against the seat surface 301 by this spring force.
[0028]
In this state, the air cylinder 133 is actuated to rotate the arm 131 to give the optical element 200 rotation in the rotation direction R. As a result, the seating surface 301 and the optical element 200 are rubbed together, and the adhesive layer interposed therebetween is uniformly thinned. Thereafter, the adhesive layer between the seating surface 301 and the optical element 200 is cured by UV irradiation from a UV irradiation apparatus (not shown). Thus, the bonding operation of the optical element 200 to the unit base 300 is completed.
[0029]
As described above, according to the present embodiment, by rotating the optical element 200 while the optical element 200 is pressed against the seating surface 301, the adhesive layer between the seating surface 301 and the optical element 200 is made thin and uniform. be able to. Therefore, it is possible to make the adhesive layer thin while securely fixing the optical element 200 to the unit base.
[0030]
In the present embodiment, the rotation operation of the optical element is performed as an operation for making the adhesive layer between the seating surface 301 and the optical element 200 thin and uniform. The linear reciprocating motion may be used as long as it is a relative motion in a plane parallel to the seating surface 301 of the optical element 200.
[0031]
【The invention's effect】
As described above, according to the optical element bonding apparatus of the present invention, by applying a rubbing operation such as rotation to the optical element or the seating surface with the optical element pressed against the seating surface, the seating surface and the optical element The adhesive layer in between can be made thin and uniform. Therefore, it is possible to make the adhesive layer thin while securely fixing the optical element to the unit base.
[Brief description of the drawings]
FIG. 1 is a diagram showing a basic configuration of a magneto-optical disk apparatus according to an embodiment.
2 is a schematic view showing an optical system of the optical disc apparatus of FIG. 1. FIG.
FIG. 3 is an enlarged view showing an objective lens and an optical disc.
FIG. 4 is a side view showing the bonding apparatus according to the embodiment.
FIG. 5 is a plan view of the bonding apparatus of FIG. 4;
6 is a side view showing a first stage of a bonding method using the bonding apparatus of FIG. 1; FIG.
7 is a side view showing a second stage of a bonding method using the bonding apparatus of FIG. 1; FIG.
FIG. 8 is a side view showing a third stage of a bonding method using the bonding apparatus of FIG. 1;
FIG. 9 is a view showing a conventional bonding method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 100 Adhesive device 111 Base 112 Seat surface 121 Holder 122 Spring 123 Slide shaft 131 Arm 141 Guide tube 144 Moving device 200 Optical element 300 Unit base

Claims (3)

A support portion for supporting a part having a predetermined seating surface to which an adhesive is applied ;
A holding portion for holding an optical element including a shaft member extending in a direction orthogonal to the seating surface ;
Moving means for moving the holding portion in a direction perpendicular to the seating surface so that the optical element is in close contact with the seating surface;
Rotating means for rotating the holding portion around the axis of the shaft member so that the optical element and the seating surface are rubbed together in a state where the moving unit is in close contact with the seating surface;
Equipped with a,
The optical element bonding apparatus , wherein the rotating means includes an arm attached to the shaft member and an actuator for operating the arm so that the shaft member rotates about its axis . Bonding apparatus of the optical element according to claim 1, the shaft member, and movably held in the axial direction, and the guide unit that rotatably supports the axis is provided, and wherein. The spring is provided between the said holding | maintenance part and the said guide part, The said moving means moves the said holding | maintenance part via the said spring and the said guide part, The Claim 2 characterized by the above-mentioned. Optical element bonding apparatus.

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