JPH1138124A - Reflection measuring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reflection measuring apparatus in which an external connector can be assembled easily with a rear lid. SOLUTION: An external connector 50 is electrically connected to an internal connector 51 mounted on a circuit board 40. When the external connector 50 is assembled with a rear lid 12, the terminal of the connector 50 is directly connected to the terminal of the internal connector 51 in the passing direction. Since an assembling hole 12a is made larger than the inserting section 50a of the connector 50, the connector 50 can be connected electrically to the connector 51 while the position of the connector 50 is adjusted even when a machining error, etc., exists. Since an O-ring 52 is put in the annular groove 12b of the lid 12, in addition, the space between the lid 12 and connector 50 is sealed when the connector 50 is assembled with the lid 12. Therefore, the assembling man-hour of the connector 50 with the lid 12 is reduced, because the assemblage of the connector 50 with the lid 12 becomes easier.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflection measuring device for measuring a distance between a measured object and a measured object.

[0002]

2. Description of the Related Art For example, in a reflection measuring device for measuring the distance between vehicles, a light beam emitted from a semiconductor laser is swung within a predetermined angle range by rotating a reflection mirror or the like by a motor to scan a vehicle to be measured. Is going. The light beam reflected from the vehicle to be measured is detected by the light receiving unit, and the distance to the vehicle to be measured is measured by the arithmetic unit. The measurement result obtained by the arithmetic unit is taken out of the measuring device from an external connector attached to the outer case.

[0003]

However, in the conventional reflection measuring device, the attachment of the external connector to the outer case and the electrical connection between the internal circuit of the reflection measuring device and the external connector are performed in separate steps. The internal circuit and the external connector are electrically connected by wires and the internal connector. For this reason, the number of parts increases, and soldering or the like is required to electrically connect the external connector and the wire. Therefore, the component cost has been increased and the assembling workability has been deteriorated.

[0004] It is an object of the present invention to provide a reflection measuring device for easily assembling an external connector.

[0005]

According to the reflection measuring device of the first aspect of the present invention, the mounting hole provided in the outer case for inserting the external connector and electrically connecting to the internal connector has a through hole for the external connector. Since it is larger than the insertion portion, the external connector and the internal connector can be reliably connected by adjusting the position of the external connector even if there is a processing error or the like. Further, the external connector and the internal connector are directly connected when the external connector is mounted on the outer case. Therefore, the external connector can be assembled and the external connector and the internal connector can be electrically connected at the same time. Therefore, the number of steps for assembling the external connector can be reduced.

According to the reflection measuring device of the second aspect of the present invention, since the seal member is fitted to the outer case side, the seal member does not fall off when the external connector is mounted, and the external connector can be mounted at the same time. The outer case and the external connector can be sealed. Claim 3 of the present invention
According to the reflection measurement device described, the direction of the external connector is set to 1
Since the external connector can be connected to the internal connector at any position rotated by 80 °, there is a degree of freedom in wiring to the external connector even if the installation space of the measuring device is limited.

[0007]

FIG. 1, FIG. 2 and FIG. 3 show an embodiment in which the reflection measuring apparatus of the present invention is applied to an inter-vehicle distance measuring apparatus. The outer case 10 of the measuring device 1 includes the light emitting unit 2
0, a reflection mirror 21, a polygon mirror 23, a light receiving lens 30, a light receiving element 31, a plurality of circuit boards 40, and the like. The outer case 10 includes a box 11 and a back cover 12. The inner case 13 is provided inside the outer case 10 and assembles the components of the measuring device 1.

The light emitting unit 20 is a unit in which a semiconductor laser diode, an emission lens and the like are unitized.
A drive signal is supplied to the semiconductor laser diode from a circuit board 40 having a drive circuit. The reflection mirror 21 is attached to the interior case 13 by a spring 22. The spring 22 has one end locked to the reflection mirror 21 and the other end locked to the interior case 13. Therefore, the reflection mirror 21 can be attached to the interior case 13 even in a narrow space without using a screw or the like, so that the area around the reflection mirror can be reduced.

Also, projections are provided at one of the four corners of the mounting base of the reflection mirror 21, and one corner of the reflection mirror 21 is cut out so as to avoid the projection.
Therefore, when attaching the reflection mirror 21 to the mounting base,
The reflection mirror 21 can be mounted on the mounting table without making any mistakes. The light emitted from the semiconductor laser diode is reflected by the reflection mirror 21 and further reflected by the polygon mirror 23. The polygon mirror 23 has six mirrors with different inclination angles installed on a turntable (not shown). The turntable is rotated at a predetermined speed by a motor (not shown). The light beam reflected by the polygon mirror 23 is emitted toward a vehicle as an object to be measured.

The light receiving lens 30 guides the reflected light from the measured vehicle to the light receiving element 31. The light receiving element 31 is, for example, PI
An N photodiode or an avalanche photodiode is used. The arithmetic circuit (not shown) mounted on the circuit board 40 is obtained by the following equation (1) based on the difference between the light receiving time and the light emitting time of the reflected light from the vehicle under measurement which has entered the light receiving element 31 via the light receiving lens 30. Calculate the distance to the measurement vehicle.

Inter-vehicle distance = (light receiving time−light emitting time) × light speed × 1/2 (1) The calculated result is taken out of the measuring device 1 from the external connector 50. The inspection pin 55 is provided for easily attaching a probe or the like of the inspection device to measure the relationship between the incident angle and the amount of received light. Next, the measuring device 1
Will be described in detail.

The back cover 12 of the outer case 10 is
3 is screwed to a pole 14 screwed.
An annular groove 14a is formed on the surface of the pole 14 around the screw hole facing the back cover 12, and an O-ring 15 is fitted into the annular groove 14a. That is, the O-ring 15 is the pole 1
The O-ring 15 can be prevented from being twisted by the tightening force of the screw since the O-ring 15 is sandwiched between the back cover 4 and the back cover 12 and does not receive the tightening force of the screw 16 in the rotating direction.

Further, the pole 14 and the metal interior case 13 are in direct contact with each other, and the circuit board 40 is sandwiched between the pole 14 and the interior case 13 via a washer 25 fitted around the pole 14. ing. Therefore, even if the resin circuit board 40 expands and contracts due to a temperature change, the joining position of the metal parts does not change, so that the displacement of the components of the entire measuring apparatus 1 can be prevented.

The pole 17 shown in FIG. 2 is formed in a hollow cylindrical shape, and is used to hold the circuit board 40 floating from the interior case 13. Pole 17 and interior case 13
And a shield plate 18 interposed therebetween. The shield plate 18 is provided with four projections 18a at the apexes of a square. By disposing the poles 17 in these projections 18a, the positioning of the poles 17 can be facilitated.

As shown in FIG. 1, the external connector 50
It is electrically connected to the internal connector 51 attached to the circuit board 40, inputs various control signals from outside the measuring device, and takes out the calculated measurement distance to the outside. The external connector 50 has an assembling hole 12 a formed in the back cover 12.
Through the insertion portion 50a with the internal connector 51,
It is screwed to 2. An annular groove 12b is formed in the outer wall of the back cover 12 facing the external connector 50 around the mounting hole 12a, and an O-ring 52 as a sealing member is fitted in the annular groove 12b.

When the external connector 50 is inserted through the mounting hole 12a, that is, when the external connector 50 is mounted on the back cover 12, the terminals of the external connector 50 are directly connected to the internal connector 51 in the insertion direction. The mounting hole 12a is connected to the external connector 50.
Since it is formed so as to be larger than the insertion portion 50a, even if there is a processing error or the like, it can be electrically connected to the internal connector 51 while adjusting the position of the external connector 50. Further, since the O-ring 52 is fitted into the annular groove 12b of the back cover 12, the external connector 50 is mounted on the back cover 12 and at the same time, the back cover 12 and the external connector 50 are connected.
Is sealed.

Further, the external connector 50 is mounted at one position.
It is formed so that it can be inserted into the mounting hole 12 a even when rotated by 80 °, and is electrically connected to the internal connector 51. Therefore, by changing the direction of the external connector 50 according to the mounting space of the measuring device 1,
There is a degree of freedom in wiring to zero. However, external connector 5
It is necessary to adjust the signal position of a wire cable or the like according to the direction of 0.

The light-receiving side wall surface 13a of the interior case 13 is inclined so as to reduce the diameter in the mounting direction of the light-receiving lens 30, and functions as a guide when the light-receiving lens 30 is mounted. Therefore, the light receiving lens 3 is
0 can be easily attached. As shown in FIG. 3, a protection wall 13 b that protects a circuit element mounted on the circuit board 40 is provided at an end of the interior case 13. Therefore, the circuit board 40 assembled in the interior case 13 is
Can be prevented from being caught and damaged by the circuit element when it is inserted into the box body.

Further, a resin film 42 is wound around a PC jumper 41 connecting between the circuit boards 40. This protects the covering of the PC jumper 41 and prevents the PC jumper 41 from short-circuiting to peripheral components. In the above-described embodiment showing the embodiment of the present invention described above, the reflection measuring device for measuring the inter-vehicle distance of the vehicle has been described, but the distance between the measured object and the measured object is measured by irradiating light rays. The present invention may be applied to any device that measures the distance between objects as long as it is a device.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an inter-vehicle distance measuring apparatus according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a connection state between a circuit board and an interior case according to the embodiment.

FIG. 3 is a cross-sectional view illustrating a light receiving unit in the present embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reflection measuring device 10 Exterior case 11 Box (exterior case) 12 Back cover (exterior case) 12a Assembly hole 12b Annular groove 20 Light emitting unit 30 Light receiving lens 40 Circuit board 50 External connector 50a Penetrating part 51 Internal connector 52 O-ring (Seal member)

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Tsukasa Miyake 1-1-1, Showa-cho, Kariya-shi, Aichi Prefecture Inside Denso Corporation (72) Inventor Koji 1-1-1, Showa-cho, Kariya-shi, Aichi Prefecture Denso Corporation Inside

Claims (3)

[Claims] 1. A reflection measurement device for irradiating a light beam from a measurement object to a measurement object to measure a distance between the measurement object and the measurement object, comprising: an outer case; and a set provided on the outer case. An external connector that is inserted into the attached hole and is attached to the outer case and electrically connects the inside and the outside of the reflection measuring device; and an internal connector that is provided in the outer case and that is electrically connected to the external connector. Wherein the external connector and the internal connector are directly connected when the external connector is mounted on the outer case, and the mounting hole is larger than a penetrating portion of the external connector. apparatus. 2. The reflection measuring device according to claim 1, wherein a groove for fitting a seal member is provided on an outer wall of the outer case around the mounting hole facing the external connector. 3. The reflection measuring device according to claim 1, wherein the external connector can be connected to the internal connector at any position rotated by 180 °.