JP2684176B2 - Positioning mechanism for optical components - Google Patents

Description

Description: [Industrial application] The present invention relates to a mechanism for positioning and attaching an optical component that constitutes an optical system to a reference base plate. [Prior Art] When constructing an optical system, various optical parts are attached to a base board that serves as a reference, but the optical axes at the centers of the respective parts are aligned (alignment), and each part is on the optical axis. , Must be accurately placed at a designed position based on optical constants such as focal lengths (this placement will be referred to as focusing hereinafter for convenience). However, generally, the tolerance of the optical constants of the parts is quite large, so even if the optical system preassembled in the optical device manufacturing factory is incorporated into the device, for example, based on a part of a specific inspection device as a reference base, When an optical system is constructed by incorporating a single component into this, it is necessary to mount each component on an appropriate fine movement mechanism and perform alignment and focusing operations. An actual example will be described below with reference to FIG. 3 (a), (b) and (c) illustrate an example of an inspection device for soldering of the LSI package 2 mounted on the printed circuit board 1. In FIG. The lead wire 2a is soldered to the printed wiring 1a provided on the substrate 1, and this portion is irradiated with a laser beam L having a substantially linear cross section from above, and at the same time, jet air W is jetted to the lead wire. It is an inspection device that optically detects the generated vibration and, if it is vibration, the solder receiver is incomplete. FIG. 2B is a configuration diagram of the optical system. A laser beam 3a having a circular cross section (indicated by an arrow U _{1 in} the horizontal direction and an arrow V ₁ in the vertical direction) from the laser light source 3 is a mirror because of the arrangement of parts. It is changed in the opposite direction by 4a and 4b, passes through a lateral expander composed of cylindrical lenses 5a and 5b and a longitudinal compander composed of cylindrical lenses 6a and 6b, and is shown in the refraction diagram of FIG. Thus, it is converted into a beam with an elliptical cross section in the horizontal direction (long axis) U ₂ and the vertical direction (short axis) V ₂ . This laser beam passes through a mirror 4c, a half mirror 7, and an oscillating mirror 8 and enters a projecting / receiving lens 9, where a short axis V ₂ is further focused and a linear laser beam having a width of about several tens of μm. It becomes L and irradiates the soldering part. For such an optical system configuration,
As described above, it is necessary to adjust the alignment and the focus. For this reason, conventionally, each optical component such as a cylindrical lens and a mirror is mounted on the linear movement mechanism 14 illustrated in FIG. 4 (a). It is mounted on the reference base board 10 and aligned. In the figure, a U-shaped support 11 is fixed to a reference base board 10, a fixing portion 14a of a moving mechanism 14 is fixed to the support 11, and the side surface of the moving portion 14b is the tip of the micrometer head 13. When pressed with, the moving part moves along the slide rod 15 against the spring 12. This will position the optics 17 correctly,
It is fixed by the fixing screw 16 at this position. However, fixing with this fixing screw is a bender. As shown in FIG. 4 (b), when the tip of the fixing screw 16 is rotated, the surface of the slide rod and the tip of the fixing screw are both arcs, so a delicate force is generated in the moving part. Displacement occurs in the position of the component that has moved and is actually positioned. With this, fine adjustment by a fine micrometer is completely meaningless. Furthermore, in the above-mentioned inspection apparatus, parts are removed and reattached for the purpose of 4 maintenance or the like, but the reattachment has the inconvenience of requiring re-adjustment of the micrometer. With respect to these drawbacks, a simple and effective positioning mechanism is desired. [Object of the Invention] In view of the above description, the present invention can fix the components constituting the optical system to the base board without any deviation in the positioning position, and does not require adjustment when reattaching the components. The purpose is to provide a simple and effective positioning mechanism. [Means for Solving the Problems] The features of the positioning mechanism of the optical component of the present invention for achieving the above-mentioned object are a positioning plate to which a holder for holding the optical component is fixed, and a reference base for the optical system. A guide pin that is implanted in the board and guides the positioning plate in contact with the side surface of the positioning plate in the optical axis direction of the optical system or in a direction perpendicular to the optical axis, and a reference base board for finely moving the positioning plate along the guide pin. And the positioning plate are provided concentrically with each other and the prison position adjustment hole with a small hole in the reference base board and fine movement in the direction guided by the guide pin provided on the positioning plate are allowed, and positioning is performed via screws. An elliptical hole for fixing the plate, and a reference base that contacts the side surface of the positioning plate that is perpendicular to the guide direction of the guide pin to store the position of the positioning plate. A storage plate that is fixed to the board with a screw, and the positioning plate is finely moved and positioned through the prying position adjustment hole, the positioning plate is fixed through the elliptical hole, and the storage plate is further fixed. Is. [Operation] In the optical component positioning mechanism of the present invention having the above-described configuration, the movement of the positioning plate may be limited to only this direction by the guide pin provided in the direction of the optical axis of the optical system or in the direction orthogonal thereto. By using the twist position adjusting hole and the elliptical hole, the positioning plate is finely moved along the guide pin to perform a predetermined position adjustment. After that, the positioning plate is fixed to the reference base plate by screwing, but the positional deviation due to the fine movement does not occur unlike the conventional micrometer system. When the positioning is achieved as described above, the memory plate is brought into contact with and fixed to the side surface of the positioning plate. When the optical component is reattached after being removed, the guide pin and the memory plate can be easily attached to exactly the same position as the previous positioning position. In the above, when the guide direction of the guide pin is the optical axis direction, it is for adjusting the movement (focusing) of the optical component in the optical axis direction, and when it is the direction orthogonal to the optical axis, the central axis of the optical component is Can be used respectively for adjusting the movement (alignment) in the right angle direction, but in practice they are carried out in a combined state, so a mechanism in which guide pins and memory plates for these two directions are superposed is used. This makes focusing and alignment simple and accurate, and facilitates reattachment of parts. In the above description, the adjustment function is not taken into consideration with respect to the inclination angle of the optical component with respect to the optical axis, but this point is that the necessary adjustment is made when the holder is attached to the positioning plate. [Embodiment] FIGS. 1 (a), (b) and (c) are structural views of an embodiment of an optical component positioning mechanism according to the present invention.
Figure (a) is a perspective external view, Figure (b) is a plan view, and Figure (c) is a vertical sectional view taken along the line AA of Figure (b). In Figure (a), the optical component 17a is shown. Hold the holder 17
However, it is assumed that the elliptical hole 18a for mounting the positioning plate 18 is fixed in advance with good position accuracy. The positioning plate is composed of two guide pins 19a provided on the reference base 11,
Tentatively fix it with the elliptical hole 18a in contact with 19b, move the positioning plate along the guide pin to perform the alignment work, and when this is completed, fasten and fix 18b to the set screw of the elliptical hole, and The memory plate 21 is brought into contact with the side surface of the positioning plate and fixed by screwing. In order to facilitate fine movement of the positioning plate, concentric adjustment holes 20 are provided in both the positioning plate and the reference base, and a metal rod is inserted into the adjustment hole 20 to pry it, whereby fine movement can be performed. As shown in FIG. 1 (c), the adjustment holes 20 are provided on both the reference base plate 11 and the positioning plate 18, and the holes of the reference base plate 11 have a small diameter so that they can be twisted with a bar and have a substantially small diameter. They are arranged concentrically. Pry bar is the standard base board 11
When it is inserted into the hole and is twisted, the edge of the hole of the positioning plate 18 engages with the rod, and the positioning plate 18 slightly moves. Since the amount of movement of the positioning plate 18 is very small, as shown in FIG. 1 (c), the elliptical hole 18a and the set screw 18b are different from the edge portions provided at both ends in the longitudinal direction of the elliptical hole 18a. It engages with the lower edge of set screw 18b. As a result, the positioning plate 18 is fixed. Further, the memory plate 21 is fixed in a circular shape as shown in the drawing, and is fixed by tapping or by self tapping with a screw. Next, in the case of removing the optical component, it is removed from the reference base plate together with the positioning plate, and the guide pin and the memory plate are fixed in position as they are. By doing so, the same positioning state as before is immediately restored. FIG. 2 shows a positioning mechanism for combining the mechanism shown in FIG. 1 in a double manner to adjust the movement in the direction of the optical axis and the direction perpendicular thereto.
-1 and a guide pin 19-1 corresponding thereto are provided, the positioning plate 18-1 is positioned in the X direction and fixed to the reference base 11, and then the X direction memory plate 21-1 is fixed. next,
With respect to the direction indicated by the arrow Y, the Y direction positioning plate 18-2,
The guide pin 19-2 and the Y-direction memory plate 21-2 perform the positioning and fixing similar to the above. In this case, the optical components
The holder 17 is fixed to the Y-direction positioning plate 18-2 by a holder 17. In FIG. 2, the positioning plate 18-
Although the prying position adjusting hole 1 is not visible, it is because it is hidden behind the memory plate 21-2. By the way, the above is for the movement adjustment in the X and Y directions, but the one for the X and Z directions, or the one having a triple structure in the three directions of X, Y and Z can also be constructed by the above analogy. It is a thing. [Effects of the Invention] As is clear from the above description, according to the positioning mechanism for an optical component of the present invention, fine movement adjustment in the guide pin direction is smoothly performed by the guide pin, the prying position adjusting hole, and the elliptical hole. The positioning is performed and the position is accurately fixed without the positional deviation due to the set screw of the conventional micrometer system. Further, the memory plate can restore the positioned state correctly and easily when the parts are reattached. By combining them in a double or triple manner, positioning of each component can be easily achieved when a single optical component is attached to form an optical system with the casing of an arbitrary device as a reference base. It provides accurate and easy positioning restoring means in the subsequent maintenance, is economically advantageous by using only extremely simple mechanical parts, and has a great effect in contributing to this direction.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 (a), (b) and (c) are perspective external views, a plan view and a vertical sectional view of a structure in one embodiment of a positioning mechanism for an optical component according to the present invention. FIG. 2 is a structural view of another embodiment of the positioning mechanism for an optical component according to the present invention. FIG. 2 is a perspective external view when the mechanism shown in FIG. 1 is double combined, and FIGS. 3 (a), 3 (b) and (C) is an explanatory view of an inspection method and an optical system in a printed circuit board soldering inspection apparatus showing an example of an optical system to which the present invention is applied. FIG. 4 is a printed circuit board soldering inspection apparatus shown in FIG. FIG. 14 is a perspective external view of a mechanism using a micrometer as an example of a conventional optical component positioning mechanism in FIG. 1 ... Printed circuit board, 1a ... Printed wiring, 2 ... LSI package, 2a ... Lead wire, 3 ... Laser light source, 3a ... Laser beam, 4a, 4b, 4c ... Mirror, 5 ... Lateral direction Expander, 5a, 5b, 6a, 6b …… Cylindrical lens, 6 …… Vertical compander, 7 …… Half mirror, 8 …… Vibration mirror, 9 …… Throw / receive lens, 10 …… Reference base board, 11 …… Supporting tool, 12 …… Spring, 13 …… Micrometer, 13a …… Tip, 14 …… Linear movement mechanism, 15 …… Slide rod, 16 …… Fixing screw, 17 …… Optical component holder, 17a ...... Optical parts, 18 …… Positioning plate, 18a …… Oval hole, 18b …… Set screw, 19 …… Guide pin, 20 …… Adjustment hole, 21 …… Memory plate.

Continuation of front page    (72) Inventor Koichi Karazaki               1 Horiyamashita, Hadano City Hitachi, Ltd.               Tokoro Kanagawa Factory                (56) References JP-A-60-115904 (JP, A)                 JP 61-32015 (JP, A)                 JP 62-42335 (JP, A)                 59-45741 (JP, U)

Claims (1)

(57) [Claims] A positioning plate to which a holder for holding an optical component is fixed and a reference base plate for the optical system are implanted, and contact the side surface of the positioning plate to perform the positioning in the optical axis direction of the optical system or in a direction perpendicular to the optical axis. Guide pins that guide the board,
In order to finely move the positioning plate along the guide pins, the reference base plate and the positioning plate are provided concentrically with each other, and a prying position adjusting hole having a small hole diameter is provided on the positioning plate. An elliptical hole for fixing the positioning plate via a screw, which allows fine movement in a direction guided by the guide pin, and a guide direction of the guide pin for storing the position of the positioning plate. On the other hand, a memory plate screwed and fixed to the reference base plate by contacting the side surface of the positioning plate in the right angle direction, by finely positioning the positioning plate through the prying position adjusting hole, A positioning mechanism for an optical component, wherein the positioning plate is fixed through the elliptical hole, and the memory plate is further fixed.