Optical displacement measuring apparatus
First Claim
1. An optical displacement measuring apparatus comprising a reflection-type scale and a sensor head opposite to the scale with a gap so as to be relatively movable, the sensor head irradiating the scale as to output a displacement signal, wherein the sensor head comprises:
- a resin-molded block having a hole, which is opened on a front surface opposed to the scale, and interconnection lines formed thereon;
a light emitting device buried in the hole of the resin-molded block so as to irradiate the scale, the light emitting device being connected to the interconnection lines on the resin-molded block;
a device substrate attached to the front surface of the resin-molded block; and
a light detecting device mounted on the device substrate for detecting reflected light from the scale, the light detecting device being connected to the interconnection lines on the resin-molded block,wherein the device substrate is a transparent substrate and the light detecting device is disposed on the transparent substrate so as to be disposed between the resin-molded block and the transparent substrate.
1 Assignment
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Accused Products
Abstract
In an optical encoder having a reflection-type scale and a sensor head 1, the sensor head 1 is formed of a resin-molded block 10. The block 10 has a hole 15 opened to be opposed to the scale, and interconnection lines. In the hole 15, a light emitting device 20 is buried so as to irradiate the scale. A device substrate 30, on which a light receiving IC chip 32 is mounted for receiving the reflected light from the scale, is attached to the front surface of the block 10. The interconnection lines 12, to which the light emitting device 20 and the IC chip 32 are connected, are led to external circuits through an FPC substrate 40.
39 Citations
9 Claims
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1. An optical displacement measuring apparatus comprising a reflection-type scale and a sensor head opposite to the scale with a gap so as to be relatively movable, the sensor head irradiating the scale as to output a displacement signal, wherein the sensor head comprises:
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a resin-molded block having a hole, which is opened on a front surface opposed to the scale, and interconnection lines formed thereon; a light emitting device buried in the hole of the resin-molded block so as to irradiate the scale, the light emitting device being connected to the interconnection lines on the resin-molded block; a device substrate attached to the front surface of the resin-molded block; and a light detecting device mounted on the device substrate for detecting reflected light from the scale, the light detecting device being connected to the interconnection lines on the resin-molded block, wherein the device substrate is a transparent substrate and the light detecting device is disposed on the transparent substrate so as to be disposed between the resin-molded block and the transparent substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An optical displacement measuring apparatus comprising a reflection-type scale and a sensor head opposite to the scale with a gap so as to be relatively movable, the sensor head irradiating the scale as to output a displacement signal, wherein the sensor head comprises:
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a resin-molded block having a concave mirror formed on a front surface to be opposed to the scale, and interconnection lines; a device substrate attached to the front surface of the resin-molded block; a light emitting device mounted on the device substrate for irradiating the concave mirror, the light emitting device being connected to the interconnection lines on the resin-molded block through the device substrate; and a light detecting device mounted on the device substrate for receiving a reflected light from the scale irradiated by the concave mirror, the light detecting device being connected to the interconnection lines on the resin-molded block through the device substrate, wherein the device substrate is a transparent substrate and the light detecting device is disposed on the transparent substrate so as to be disposed between the resin-molded block and the transparent substrate. - View Dependent Claims (9)
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Specification