JPH09229679A - Distance measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide low-cost manufacurability with an excellent space efficiency without using leads, etc., to connect a printed circuit board of a light receiving element to a control base board. SOLUTION: A light projecting element and a light projecting lens are internally installed on the light projection side 21 of a holder 2 fixed to a control base board 1, and a light receiving element and a light receiving lens are internally installed on the light reception side 22. Circuit boards 3, 4 are fixed to the control base board 1 so that a long hole 1a having a length greater than their crosswise width is formed. The circuit board 4 is slid within the long hole 1a so as to coordinate the positioning relative to the control base board 1, and alignment of the lens with the element is taken, and fixation to the control base board is established through electroconductive patterns using a solder bridge.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical triangulation type distance measuring device used in an autofocus camera or the like.

[0002]

2. Description of the Related Art Conventionally, there are various types of distance measuring devices. Among them, a light beam is emitted from a light projecting element toward a subject through a light projecting lens, and reflected light from the subject is received through a light receiving lens. There is an optical triangulation range finder that receives light by an element, calculates the change in the image forming position on the light receiving element due to the change in the distance to the subject, and measures the distance to the subject by the triangulation method.

As such a conventional optical triangulation type distance measuring device, there is a distance measuring device described in FIG. 2 of Japanese Utility Model Laid-Open No. 4-61013. This actual Kaihei 4-610
In the distance measuring device described in Japanese Patent No. 13, the light emitting side 11 of the AF holder 1 is provided with a light emitting (projecting) element, and the light receiving side 12 is provided with a light receiving element. Rigid printed board (substrate) 5 separated from
It is fixed to. Then, the lead wire 6 connected to the printed board 5 by soldering establishes electrical connection with a control board (not shown). Further, as a structure for mounting the printed board 5 on the AF holder 1 and adjusting the position, the elongated holes 5a parallel to the horizontal direction are formed on the printed board 5,
5b, an insertion hole 5c through which the set screw 3 is inserted, and a fitting groove 5d into which the head 4a of the eccentric pin 4 is fitted. And
By fitting the guide pins 1a and 1b of the AF holder 1 into the long holes 5a and 5b of the printed board 5 and tightening the set screw 3 into the screw hole 1c of the AF holder 1, the printed board 5 is
The pin portion 4 of the eccentric pin 4 is attached to the F holder 1
b is press-fitted into the press-fitting hole 1d of the AF holder 1 and its head 4a
The printed board 5 can be rotated by rotating the inside of the fitting groove 5d.
The relative positional relationship between the AF holder 1 and the AF holder 1 is adjusted so that the light receiving element and the light receiving lens (not shown) are aligned.

[0004]

However, in the above-mentioned conventional distance measuring device, since the printed board of the light receiving element and the control board are connected by the lead wire, there is a problem that the space efficiency is poor and the cost is high. there were. Also, when adjusting the positional relationship between the printed board and the AF holder, it is necessary to provide the printed board and the AF holder with elongated holes and guide pins as described above, and since eccentric pins are used, the cost is high. There was a problem.

[0005]

As a means for solving the above problems, the present invention provides a circuit board having a light projecting element or a light receiving element in order to provide a low-cost distance measuring device with a simpler mechanism. The control board is directly connected, and in this connection, the control board is provided with a long hole into which the circuit board can be fitted and slid. Accordingly, by sliding the circuit board fitted in the elongated hole, the relative positional relationship between the circuit board and the control board is adjusted, and the lens and the light emitting element or the light receiving element are easily aligned with each other. be able to. Then, the circuit board and the control board can be directly connected and fixed by soldering or the like to establish conduction.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention includes a light projecting element for emitting a light beam toward a subject through a light projecting lens, a light receiving element for receiving reflected light from the subject through a light receiving lens, a light projecting element and a light receiving element. This is a triangulation type distance measuring device including a holder portion provided with elements and a control board. And, it has a circuit board on which at least one of a light emitting element and a light receiving element is mounted, and a long hole into which the circuit board can be fitted is formed in the control board. The long hole is formed in such a length that the relative position between the control board and the circuit board can be adjusted by sliding the fitted circuit board. The control board is provided with a connection pattern, and the circuit board is provided with a wiring pattern which can be electrically connected to the connection pattern and can be fixed by a solder bridge. Further, one of the connection pattern and the wiring pattern is formed wider than the other so that the connection pattern and the wiring pattern can be electrically connected even when the relative position of the control board and the circuit board changes.

In the distance measuring device of the triangulation type, since it is important to align the light receiving lens and the light receiving element on the light receiving side, at least the light receiving element is mounted on the circuit board, and the control circuit board has the light receiving side circuit board. It is desirable to form a long hole into which can be fitted. The circuit board is preferably installed such that the surface direction of the circuit board is orthogonal to the center line of the light emitting or receiving direction of the light projecting element or the light receiving element. The control board is preferably installed such that its surface direction is parallel to the center line. Therefore, the circuit board can slide in any of the up, down, left, and right directions inside the elongated hole formed in the control board, and the lens can be aligned with the light projecting element or the light receiving element.

Further, the connection pattern and the wiring pattern formed as conductive patterns on the control board and the circuit board are formed at positions facing each other when the circuit board is fitted into the elongated hole of the control board. If one of the connection pattern and the wiring pattern is formed wider than the other, it is possible to establish continuity even when the circuit board is slid in the slot when positioning the circuit board. . The width of the conductive pattern may be set to a width sufficient for conduction according to the length of the long hole. Further, if the connection pattern and the wiring pattern are fixed by the solder bridge, the circuit board will be fixed to this device.

[0009]

Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 shows the overall configuration of a distance measuring device according to an embodiment of the present invention. A holder portion 2 is fixed to the lower side of the control board 1 of the distance measuring device. Holder part 2
The light emitting side 21 of the holder 2 has a light emitting element (IRED) and a light emitting lens (not shown) built therein, and the light receiving side 22 of the holder 2 has a light receiving element (PSD) 5 and a light receiving lens 6 shown in FIG. ing. This optical triangulation type distance measuring device irradiates infrared light from a light projecting element (IRED) on the light projecting side 21 through a light projecting lens toward an object to be measured and reflects light from the object. Light receiving element (PSD) 5 through light receiving lens 6
Light-receiving element 5 that is imaged on top and changes in distance to the object
The change in the image forming position above is calculated based on the current output from the light receiving element 5, and the distance to the object is measured by the triangulation method.

On the back side of the holder portion 2, there are provided a circuit board 3 having a light projecting element fixed inside thereof and a circuit board 4 having a light receiving element 5 fixed inside thereof. The control board 1 has a long hole 1 into which the circuit board 3 and the circuit board 4 are fitted.
a and 1a are formed. Each of the circuit board 3 and the circuit board 4 is fixed to the control board 1 by soldering as described later.

FIG. 2 shows the structure of the light-receiving side of the distance measuring device, which is a circuit board 4 mounted on the back side of the holder portion 2.
Is provided with a light receiving element 5. Terminal pin 5 of light receiving element 5
The letter a penetrates the circuit board 4, protrudes to the back side, and is fixed by the solder 5b. A light receiving lens 6 is provided in a window (not shown) on the front side of the holder 2. The circuit board 4 is fitted in the elongated hole 1 a of the control board 1. As shown in FIG. 3, the elongated hole 1a is formed longer than the width of the circuit board 4, and the relative positional relationship with the control board 1 can be adjusted by sliding the circuit board 4 vertically and horizontally. There is.

Further, on the back surface of the control board 1, there is provided a connection pattern 1b facing the elongated hole 1a and connected to a control circuit (not shown). This connection pattern 1 is provided on the circuit board 4.
b is provided with a wiring pattern 4a that can be electrically connected to
It is electrically connected by a and the solder 5b. The connection pattern 1b and the wiring pattern 4a are connected by a solder bridge as described later. The wiring pattern 4a has a wide portion formed wider than the lateral width of the connection pattern 1b. Therefore, the circuit board 4 is attached to the long hole 1a
Even when the circuit board 1 is slid inside and the position of the circuit board 1 is displaced, a sufficient conductive surface is secured between the wiring pattern 4a and the connection pattern 1b.

In the distance measuring device configured as described above,
A method of attaching the circuit board 4 to the control board 1 and the holder portion 2 will be described. FIG. 2A shows a state before the circuit board 4 is attached to the control board 1 and the holder portion 2 and the position is adjusted, and the circuit board 4 is fitted into the elongated hole 1a from the back surface side. Then, as shown in FIG. 2B, the position in the vertical direction is adjusted, and the position is also adjusted in the horizontal direction,
The light receiving element 6 and the light receiving lens 6 are aligned so that the center lines S thereof coincide with each other. Thereafter, the connection pattern 1b shown in FIG. 3 and the wiring pattern 4a are connected by the solder bridge 7 shown in FIG. 2 (b). As a result, the circuit board 4 is fixed to the control board 1. Although the configuration of the light-receiving side 22 and the mounting method of the light-receiving side circuit board 4 of this device have been described above, the configuration of the light-projecting side 21 and the mounting or positioning of the light-projecting side substrate 4 are basically the same.

[0014]

As described above, the distance measuring device of the present invention has the control board provided with the long hole into which the circuit board can be fitted and slid, and the wiring pattern having the wide portion on either board. , The circuit board on which the light emitting element or the light receiving element is mounted is directly connected to the control board, and the circuit board fitted in the long hole is slid to adjust the relative positional relationship between the circuit board and the control board. Since the lens is aligned with the light emitting element or the light receiving element, there is no need for lead wires, cables, etc. as in the past, and the positioning mechanism is simple, so space efficiency is low and cost is low. Assembly is also easy.

[Brief description of drawings]

FIG. 1 is a rear perspective view of a distance measuring device according to an embodiment.

2A and 2B are enlarged cross-sectional views of the light receiving side of FIG. 1, in which FIG. 2A shows a state before the positioning adjustment of the circuit board, and FIG. 2B shows a state after the positioning adjustment.

FIG. 3 is an enlarged rear perspective view of the distance measuring device according to the embodiment.

[Explanation of symbols]

 1 control board 1a long hole 1b connection pattern 2 holder part 3 light emitting side circuit board 4 light receiving side circuit board 4a wiring pattern 5 light receiving element 6 light receiving lens 7 solder bridge

Claims (1)

[Claims] 1. A light projecting element for emitting a light beam toward a subject through a light projecting lens, a light receiving element for receiving reflected light from the subject through a light receiving lens, the light projecting element and the light receiving element. A triangulation type distance measuring device comprising a holder portion and a control board, comprising a circuit board on which at least one of the light emitting element and the light receiving element is mounted, and the control board includes the circuit. An elongated hole is formed so that the board can be fitted, and the elongated hole is formed to have a length such that the relative position of the control board and the circuit board can be adjusted by sliding the fitted circuit board. The control board is provided with a connection pattern, and the circuit board is provided with a wiring pattern capable of conducting with the connection pattern and being fixed by a solder bridge. The distance measuring device is characterized in that one of the wiring pattern and the wiring pattern is formed wider than the other so as to be able to conduct even when the relative position of the control board and the circuit board changes.