JP2005251795A - Light source equipped with light emitting diode, and distance measuring equipment using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source which can emit only of the light out of emission light from a light emitting diode which is emitted from an LED chip directly toward the convex lens of a molded body and is reflected by the convex lens into such a direction that an angle of divergence may become smaller and then is emitted in a regular direction. <P>SOLUTION: The light emitting diode 2 is such that the LED chip 5 is connected to a pair of leads 3 and the connecting sections are molded by the molded body 7 wherein the convex lens 8 is formed on a face facing an emission face 5a of the LED chip 5 for reflecting and emitting the emission light from the LED chip 5, in such a direction that the angle of divergence may become smaller. On the emission side of the light emitting diode 2, a condensing lens 9 is located which condenses, out of the emission light from the light emitting diode 2, only of the light which is emitted from the LED chip 5 directly toward the convex lens 8 of the molded body 7 and then is reflected by the convex lens 8 in such a direction that the angle of divergence may become smaller. A shade 10 which passes only of the light condensed at the condensing point out of the light emitted from the light emitting diode 2 and passed through the condensing lens 9 while interrupting the other light is so located as to cross the condensing point of the condensing lens 9. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a light source including a light emitting diode and a distance measuring device using the light source.

For example, the light emitting diode is used as a light source of a distance measuring device for measuring a distance to a subject in an autofocus camera (see Patent Documents 1, 2, 3, and 4).
JP-A-6-265346 JP-A-7-35544 JP 7-63549 A Japanese Patent Laid-Open No. 2001-311619

  In the light emitting diode, a light emitting diode chip (hereinafter referred to as an LED chip) is connected to a pair of leads, and the connection portion is molded by a mold body in which a convex lens portion is formed on a surface facing the emission surface of the LED chip. The emitted light from the LED chip is refracted by the convex lens portion of the mold body in a direction in which the divergence angle becomes smaller and emitted.

  However, in the light emitting diode, the light emitted from the LED chip directly toward the convex lens portion out of the light emitted from the LED chip is refracted by the convex lens portion in a direction in which the spread angle becomes smaller, and the normal direction In addition to the light emitted from the LED chip in the direction opposite to the light emission surface, the light reflected by the lead, the rear surface of the mold body (on the side opposite to the surface on which the convex lens portion is formed) Part of the light internally reflected by the surface) is incident on the convex lens part, and the light is also refracted by the convex lens part and emitted in a direction different from the normal direction. Measurement error due to the influence of light emitted in a direction different from the direction of.

  In the present invention, of the light emitted from the light emitting diode, only the light emitted directly from the LED chip toward the convex lens portion of the mold body and refracted in the direction in which the divergence angle decreases by the convex lens portion and emitted in the normal direction. It is an object of the present invention to provide a distance measuring device that can perform distance measurement with high accuracy using the light source.

The light source of the present invention is
A convex lens part that connects the LED chip to a pair of leads, and refracts the light emitted from the LED chip to a surface facing the emission surface of the LED chip in a direction in which the spread angle decreases, and emits the light. A light emitting diode molded by the molded body formed;
Arranged on the emission side of the light emitting diode, out of the light emitted from the light emitting diode, it is emitted directly from the LED chip toward the convex lens portion of the mold body and is refracted in a direction in which the divergence angle is reduced by the convex lens portion. A condensing lens that condenses the emitted light at one point;
Out of the light emitted from the light emitting diode and transmitted through the condenser lens, the light condensed at the condenser point is transmitted and blocked from other light. A light shielding body is provided.

  In this light source, the light blocking body has an area larger than a cross-sectional area on a surface crossing a condensing point of the condensing lens of light emitted from the light emitting diode and transmitted through the condensing lens, and a center thereof It is preferable that the light-absorbing plate is provided with a single pinhole in the portion, and the pinhole is arranged so as to coincide with the condensing point of the condensing lens.

  Further, in this light source, the light which is condensed at the condensing point of the condensing lens and transmitted through the light shielding body is substantially parallel to the side opposite to the side facing the condensing lens of the light shielding body. It is desirable to arrange a projection lens that emits light after correcting it.

The distance measuring device of the present invention is
A light-emitting diode chip is connected to a pair of leads, and the light emitted from the light-emitting diode chip is refracted in a direction in which the divergence angle is reduced to the surface facing the light-emitting diode chip. A light emitting diode molded by a molded body having a convex lens portion and a light emitting diode disposed on the light emitting side of the light emitting diode, out of the light emitted from the light emitting diode, directly from the light emitting diode chip toward the convex lens portion of the mold body A condensing lens that condenses the emitted light that is emitted and refracted in a direction in which the divergence angle is reduced by the convex lens portion, and a converging lens that is disposed across the condensing point of the condensing lens and is emitted from the light emitting diode. A light-shielding body that transmits the light condensed at the condensing point among the light transmitted through the condensing lens and blocks other light; The light-shielding body is disposed on the opposite side of the light-condensing lens from the side facing the condensing lens, and condenses light at the condensing point of the condensing lens and transmits the light-shielding body to substantially parallel light. A light source comprising a projection lens that emits;
The light sensor is arranged on the side of the light source, and includes an optical sensor that receives the return light emitted from the projection lens of the light source and reflected by the distance measuring object and outputs the signal.

  The distance measuring apparatus of the present invention includes a plurality of photoelectric conversion elements arranged in a direction intersecting with an emission direction of light from the projection lens in the optical sensor, and is emitted from the projection lens to be a distance measurement object. Photoelectric conversion of the return light incident point of the plurality of photoelectric conversion elements, the light reflected toward the optical sensor at an angle corresponding to the distance from the projection lens to the distance measuring object. It is suitable for a device that performs triangulation using a device that receives light by an element and outputs the signal.

  In the light source of the present invention, the LED chip is connected to a pair of leads, and the connection portion refracts the light emitted from the LED chip to the surface facing the light emission surface of the LED chip in a direction in which the spread angle decreases. Of the light emitted from the light emitting diode, the light emitted from the light emitting diode is directly emitted from the LED chip toward the convex lens portion of the mold body on the emission side of the light emitting diode molded by the mold body on which the convex lens portion is emitted. A condensing lens that condenses the outgoing light refracted in the direction in which the divergence angle becomes smaller at one point, crosses the condensing point of the condensing lens and exits from the light emitting diode, and the condensing lens Of the light transmitted through the light collecting point, the light collected at the condensing point is transmitted and a light shielding body that blocks other light is disposed. Of Shako, the LED emitted toward the convex lens portion directly the mold body from the chip, the refracted in a direction divergent angle by the convex lens portion is small can be emitted only light emitted in the normal direction.

  In this light source, the light shielding body has an area larger than a cross-sectional area on a surface crossing a condensing point of the condensing lens of light emitted from the light emitting diode and transmitted through the condensing lens, and a central portion thereof It is preferable that the light absorbing plate is provided with a single pinhole, and the light absorbing plate is arranged so that the pinhole coincides with the condensing point of the condensing lens. Of the light emitted from the light emitting diode, only the light emitted in the normal direction can be reliably emitted.

  In addition, the light source substantially collimates the light that is condensed at the condensing point of the condensing lens and transmitted through the light shielding body on the side opposite to the side facing the condensing lens of the light shielding body. It is desirable to have a configuration in which a projection lens that is corrected and emitted is arranged. By doing so, for example, it is used as a light source of a distance measuring device such as an autofocus camera, and the distance measuring device has a high accuracy. Measurements can be made.

  In the distance measuring device according to the present invention, the condensing lens is disposed on an emission side of the light emitting diode, the light shielding body is disposed across a condensing point of the condensing lens, and the light collecting body includes the light collecting body. A light source having the projection lens arranged on the side opposite to the side facing the optical lens is provided, and the return light emitted from the projection lens of the light source and reflected by the distance measuring object is received on the side of the light source. Since the light sensor for outputting the signal is disposed, the light emitted from the light source from the light source is directly emitted from the LED chip toward the convex lens portion of the mold body, and the convex lens portion. Therefore, only the light refracted in the direction in which the divergence angle is reduced and emitted in the normal direction can be corrected to parallel light by the projection lens and projected onto the object to be measured. The distance measurement the return light reflected by the elephant was to the distance measuring object by be received by the optical sensor can be performed with high accuracy.

  The distance measuring apparatus of the present invention includes a plurality of photoelectric conversion elements arranged in a direction intersecting with an emission direction of light from the projection lens in the optical sensor, and is emitted from the projection lens to be a distance measurement object. Photoelectric conversion of the return light incident point of the plurality of photoelectric conversion elements, the light reflected toward the optical sensor at an angle corresponding to the distance from the projection lens to the distance measuring object. It is suitable for a device that performs triangulation using a device that receives light by an element and outputs the signal, and according to the distance measuring device of the present invention, the accuracy of the triangulation can be remarkably increased. .

  1 to 4 show an embodiment of a light source of the present invention. FIG. 1 is a block diagram of the light source, FIGS. 2 and 3 are sectional views and partially cut front views of a light emitting diode, and FIG. It is a figure which shows the emitted light from a diode.

  The light source 1 of this embodiment is used for a distance measuring device such as an autofocus camera, for example, and as shown in FIG. 1, the light emitting diode 2 and the light condensing arranged on the emission side of the light emitting diode 2. The lens 9 is disposed across the condensing point of the condensing lens 9, and transmits the light condensed from the condensing point out of the light emitted from the light emitting diode 2 and transmitted through the condensing lens 9. The light shielding body 10 shields other light, and the projection lens 13 is arranged on the opposite side of the light shielding body 10 from the side facing the condenser lens 9.

  First, the light-emitting diode 2 will be described. The light-emitting diode 2 has an LED chip (light-emitting diode chip) 5 connected to one end of a pair of leads 3 and 4 as shown in FIGS. Is molded by a mold body 7 having a convex lens portion 8 formed on a surface facing the emission surface 5 a of the LED chip 5, and the emitted light from the LED chip 5 is converted into a convex lens portion 8 of the mold body 7. As a result, the light is refracted in the direction in which the divergence angle becomes smaller and emitted.

  The pair of leads 3, 4 is made of an iron-based metal having a surface plated with solder, and the planar shape of the LED chip 5 is formed at one end of one of the leads 3, 4. A chip mounting portion having a slightly larger area is formed.

  Although the structure of the LED chip 5 is not shown, an electrode is provided on each of the p-layer and n-layer of a chip-like semiconductor in which a dot-like light-emitting portion composed of a pn junction surface is formed at the center on one surface side The surface on the light emitting part side of the chip-like semiconductor is an emission surface 5a.

  The LED chip 5 is disposed on a chip mounting portion formed at one end of the one lead 3 with the surface opposite to the emission surface 5a of the LED chip 5 adhered to the lead 3. The other electrode is connected to one end of the one lead 3 and the other electrode is connected to one end of the other lead 4 via a lead wire 6.

  The mold body 7 is made of a transparent resin such as an epoxy resin, and the axis of the convex lens portion 8 has an emission optical axis from the emission surface 5a of the LED chip 5 (perpendicular to the emission surface and a point light emission). Line that passes through the center of the part).

  In the light emitting diode 2, since the point light emitting portion of the LED chip 5 emits light in various directions, the light emitted from the LED chip 5 directly from the LED chip 5 toward the convex lens portion 8. The emitted light is not only refracted in the direction in which the divergence angle becomes smaller and emitted in the normal direction by the convex lens portion 8 as indicated by the arrow in FIG. 4, but also from the LED chip 5 to its emission surface 5a. Among the light emitted in the opposite direction, one of the light reflected by the leads 3 and 4 and the light internally reflected by the rear surface of the mold body 7, that is, the surface opposite to the surface on which the convex lens portion 8 is formed. As shown by the broken line in FIG. 4, the portion enters the convex lens portion 8, and the light is also refracted by the convex lens portion 8 and emitted in a direction different from the normal direction.

  Hereinafter, among the light emitted from the light emitting diode 2, light emitted in the normal direction is referred to as normal light, and light emitted in a direction different from the normal light is referred to as ghost light.

  On the other hand, the condensing lens 9 disposed on the emission side of the light emitting diode 2 emits light emitted from the light emitting diode 2 directly from the LED chip 5 toward the convex lens portion 8 of the mold body 7. It has a lens characteristic that condenses the outgoing light refracted in the direction in which the divergence angle is reduced by the convex lens portion at one point. The condensing lens 9 may be a single lens as shown in FIG. 1 or a combination of a plurality of lenses.

  Therefore, among the normal light and ghost light emitted from the light emitting diode 2 and transmitted through the condenser lens 9, the normal light is condensed by the condenser lens 9 as indicated by the arrow in FIG. The ghost light is condensed at the point and travels in a direction other than the condensing point of the condensing lens 9 as shown by a broken line in FIG.

  The light blocking body 10 disposed across the condensing point of the condensing lens 9 is light that has been emitted from the light emitting diode 2 and transmitted through the condensing lens 9 (light including both regular light and ghost light). ) And a light absorbing plate 11 having a larger area than the cross-sectional area on the surface crossing the condensing point of the condensing lens 9 and having one pinhole 12 at the center thereof. The plate 11 is arranged with the pinhole 12 aligned with the condensing point of the condenser lens 9.

  Further, the projection lens 13 disposed on the side opposite to the side facing the condenser lens 9 of the light shielding body 10 composed of the light absorbing plate 11 is emitted from the light emitting diode 2 and transmitted through the condenser lens 9. Of the light, the light condensed at the condensing point of the condenser lens 9 and transmitted through the light shield 10, that is, the regular light transmitted through the pinhole 12 of the light absorbing plate 11 is indicated by an arrow in FIG. As shown in FIG. 4, the lens characteristic is that the light is substantially corrected into parallel light and emitted. The projection lens 13 may be a single lens as shown in FIG. 1 or a combination of a plurality of lenses.

  The light source 1 connects the LED chip 5 to a pair of leads 3, 4, and the connecting portion has a divergence angle of the light emitted from the LED chip 5 on the surface facing the emission surface 5 a of the LED chip 5. Of the light emitted from the light emitting diode 2, the mold body directly out of the LED chip 5 is directly emitted from the light emitting diode 2 molded by the mold body 7 formed with the convex lens portion 8 that is refracted and emitted in a decreasing direction. A condensing lens 9 that condenses the outgoing light that is emitted toward the convex lens portion 8 and refracted by the convex lens portion 8 in a direction in which the divergence angle is reduced. A light-shielding body 10 that transmits the light condensed at the condensing point out of the light emitted from the light-emitting diode 2 and transmitted through the condensing lens 9 across the point is arranged. Therefore, out of the light emitted from the light emitting diode, the light is emitted directly from the LED chip 5 toward the convex lens portion 8 of the mold body 7 and is refracted by the convex lens portion 8 in a direction in which the divergence angle becomes smaller. Only the regular light emitted in the direction can be emitted.

  That is, in the light source 1, out of the light emitted from the light emitting diode, the normal light emitted in the normal direction and transmitted through the condenser lens 9 is condensed as shown by the arrow in FIG. The ghost light which is condensed at the condensing point of the lens 9 and emitted from the light emitting diode 2 in a direction different from the normal direction is the condensing point of the condensing lens 9 as shown by the broken line in FIG. Head in the other direction.

  In this light source 1, since the light shielding body 10 is disposed across the condensing point of the condensing lens, the light collected from the light emitting diode 2 and transmitted through the condensing lens 9 is the condensing lens 9. Ghost light traveling in a direction other than the condensing point of the optical lens 9 is blocked by the light shielding body 10, and only regular light condensed at the condensing point of the condensing lens 9 is transmitted through the light shielding body 10 and emitted. To do.

  Therefore, according to the light source 1, only the normal light emitted in the normal direction can be emitted out of the light emitted from the light emitting diode.

  Moreover, in the said Example, the area larger than the cross-sectional area on the surface which crosses the condensing point of the said condensing lens 9 of the said light-shielding body 10 which radiate | emitted from the said light emitting diode 2, and permeate | transmitted the condensing lens 9 The light absorption plate 11 is provided with a single pinhole 12 at the center, and the light absorption plate 11 is arranged so that the pinhole 12 coincides with the condensing point of the condensing lens 9. Therefore, only the regular light emitted in the regular direction out of the light emitted from the light emitting diode 2 can be reliably emitted.

  The light source 1 of the above embodiment condenses the light shielding body on the condensing point of the condensing lens 9 on the side opposite to the side facing the condensing lens 9 of the light shielding body 10, that is, on the emission side. Since the projection lens 13 that emits the normal light that has passed through the light-shielding member 10 after being corrected to substantially parallel light is disposed, the normal light that has passed through the light-shielding body 10 can be projected as beam light. In addition to being used as a light source of a distance measuring device such as an autofocus camera, the distance measuring device can perform distance measurement with high accuracy.

  FIG. 5 shows an embodiment of the distance measuring device of the present invention. In the distance measuring device, the condensing lens 9 is disposed on the emission side of the light emitting diode 2, and the condensing point of the condensing lens 9 is shown. The light shielding body 10 is disposed across the light source, and is condensed on the light condensing point of the condenser lens 9 on the emission side of the light shielding body 10 (the side opposite to the side facing the condenser lens 9). The light source 1 of the above-described embodiment in which the projection lens 13 that emits the regular light that has passed through the light shield 10 after being corrected to substantially parallel light is disposed, and a sufficient distance is provided on the side of the light source 1. The optical sensor 14 which receives the return light emitted from the projection lens 13 of the light source 1 and reflected by the distance measuring object A and outputs the signal is disposed.

  The distance measuring device of this embodiment is an infrared distance measuring device mounted on an autofocus camera, and the LED chip 5 of the light emitting diode 2 of the light source 1 is made of a chip-like semiconductor that emits infrared light.

  In this distance measuring apparatus, the optical sensor 14 has a plurality of photoelectric conversion elements, for example, photodiodes 15 on one surface, and light from the projection lens 13 of the light source 1 (a beam corrected to substantially parallel light). The light is emitted in the direction intersecting with the emission direction of light, and is closely arranged in a line. The light is projected by the projection lens 13 and reflected by a distance measuring object (hereinafter referred to as a subject) A. Return light incident on the optical sensor 14 from an angular direction corresponding to the distance from the projection lens 13 to the subject A is received by the photodiode 15 at the incident point of the return light among the plurality of photodiodes 15. And output the signal.

  This photosensor 14 has its photodiode formation surface directed in the direction in which the projection light from the projection lens 13 is directed so that the photodiode formation surface is perpendicular to the axis O of the projection light from the projection lens 13. Accordingly, the plurality of photodiodes 15 of the optical sensor 14 are arranged in a direction orthogonal to the axis O of the projection light from the projection lens 13.

  A sensor-side lens 16 that collects the return light reflected by the subject A and makes it incident on the light-receiving surface of the photodiode 15 is disposed on the incident side of the optical sensor 14, that is, in front of the photodiode formation surface. Has been. The sensor side lens 16 may be a single lens as shown in FIG. 5 or a combination of a plurality of lenses.

  This distance measuring device performs triangulation, and is reflected by the subject A by projecting beam light emitted from the light source 1 after being corrected to parallel light by the projection lens 13 toward the subject A. The light returned from the angular direction corresponding to the distance from the projection lens 13 to the subject A toward the optical sensor 14 is the incident point of the return light among the plurality of photodiodes 15 of the optical sensor 14. The light is received by the photodiode 15 located at the position, and the signal is output from the optical sensor 14 to the distance measuring circuit 17.

  The return light reflected by the subject A is collected by the sensor-side lens 16 and is incident on the photodiode 15 located at the return light incident point among the plurality of photodiodes 15 of the optical sensor 14. To do.

  In FIG. 5, the solid line indicates the optical path when the distance from the projection lens 13 to the subject A is short, and the chain line indicates the optical path when the distance from the projection lens 13 to the subject A is long. When the distance to A is short, the return light reflected by the subject A is incident on the photodiode 15 on the side close to the light source 1 of the optical sensor 14, and the distance from the projection lens 13 to the subject A is long. The return light reflected by the subject A is incident on the photodiode 15 far from the light source 1 of the optical sensor 14.

  The optical sensor 14 outputs a signal corresponding to the position of the photodiode 15 that has received the return light among the plurality of photodiodes 15 to the distance measuring circuit 17.

  On the other hand, the distance measuring circuit 17 is preset with distance data from the axis O of the subject projection light projected from the light source 1 to the parallel light corrected by the projection lens 13 and the arrangement position of the optical sensor 14. This distance measuring circuit 17 is based on the output signal from the optical sensor 14 and from the axis O on the line orthogonal to the axis O of the subject projection light to the return light incident point of the optical sensor 14. And the incident angle of the return light with respect to the optical sensor 14, determine the distance to the subject A based on the principle of triangulation from these distances and angles, and adjust the focus of the distance measurement data (not shown) To the output.

  In this distance measuring device, the condensing lens 9 is disposed on the light emission side of the light emitting diode 2, the light shielding body 10 is disposed across the condensing point of the condensing lens 9, and the light shielding body 10 On the opposite side to the side facing the condenser lens 9, the regular light condensed at the condensing point of the condenser lens 9 and transmitted through the light shielding body 10 is corrected to substantially parallel light and emitted. A light source 1 provided with a projection lens 13 is provided, and the return light emitted from the projection lens 13 of the light source 1 and reflected by the distance measuring object A is received on the side of the light source 1 and the signal is output. Since the optical sensor 14 is disposed, the light emitted from the light source 2 from the light source 1 is directly emitted from the LED chip 5 toward the convex lens portion 8 of the mold body 7, and the convex lens portion. 8 reduces the spread angle Only normal light refracted in a normal direction and emitted in a normal direction can be corrected to parallel light by the projection lens 13 and projected onto the subject A. Therefore, the return light reflected by the subject A can be reflected on the light. The distance to the subject A can be measured with high accuracy by causing the sensor 14 to receive light.

  That is, the distance measuring device of this embodiment includes a plurality of photodiodes 15 arranged in a direction intersecting the light emitting direction from the projection lens 13 of the light source 1 in the optical sensor 14, and the projection lens. Return light that is emitted from 13 and reflected by the subject A and incident on the optical sensor 14 from an angle direction corresponding to the distance from the projection lens 13 to the subject A is selected from among the plurality of photodiodes 15. Triangular distance measurement is performed using the light received by the photodiode 15 at the incident point of the return light and the signal is output. In this triangular distance measurement, the light is emitted from the light emitting diode 2 and the projection lens 13 is output. If the light projected on the subject A includes ghost light directed in a direction inclined with respect to the axis, the ghost light affects the distance measurement accuracy. According to this distance measuring apparatus, since the regular light that hardly contains ghost light from the light source 1 can be substantially corrected by the projection lens 13 and projected onto the subject A, the accuracy of the triangular distance measurement is improved. It can be dramatically increased.

  Although the distance measuring apparatus of the above embodiment performs triangulation, the present invention projects light, which is substantially corrected to parallel light from the light source 1 by the projection lens 13, toward the subject A. The return light reflected by the subject A is received by a light sensor arranged on the side of the light source 1, and based on the time difference between the light emission from the light source 1 and the return light incidence to the light sensor. The present invention can also be applied to a distance measuring device that performs time difference ranging to determine the distance to the subject A.

  Further, the distance measuring device of the present invention is not limited to the distance measuring device of the autofocus camera, but can be applied to other distance measuring devices.

The block diagram which shows one Example of the light source of this invention. Sectional drawing of a light emitting diode. Sectional drawing and the partial cutaway front view of the said light emitting diode. The figure which shows the emitted light from the said light emitting diode. The block diagram which shows one Example of the distance measuring device of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Light source, 2 ... Light emitting diode, 3, 4 ... Lead, 5 ... LED chip, 5a ... Outgoing surface, 6 ... Lead wire, 7 ... Mold body, 8 ... Convex lens part, 9 ... Condensing lens, 10 ... Light-shielding body DESCRIPTION OF SYMBOLS 11 ... Light absorption board, 12 ... Pinhole, 13 ... Projection lens, 14 ... Optical sensor, 15 ... Photodiode (photoelectric conversion element), 16 ... Sensor side lens, 17 ... Distance measuring circuit, A ... Subject (distance measurement) Object).

Claims (5)

A light-emitting diode chip is connected to a pair of leads, and the light emitted from the light-emitting diode chip is refracted in a direction in which the divergence angle is reduced to the surface facing the light-emitting diode chip. A light emitting diode molded by a molded body having a convex lens portion;
Arranged on the emission side of the light-emitting diode, out of the light emitted from the light-emitting diode, the light is emitted directly from the light-emitting diode chip toward the convex lens portion of the mold body and refracted in a direction in which the divergence angle is reduced by the convex lens portion. A condensing lens that condenses the emitted light at one point;
Out of the light emitted from the light emitting diode and transmitted through the condenser lens, the light condensed at the condenser point is transmitted and blocked from other light. A light source comprising a light shielding body.   The light-shielding body has an area larger than the cross-sectional area on the surface crossing the condensing point of the condensing lens of the light emitted from the light emitting diode and transmitted through the condensing lens, and one pinhole is formed at the center thereof. 2. The light source according to claim 1, comprising a light absorbing plate provided and arranged so that the pinhole coincides with a condensing point of a condensing lens.   A projection lens that condenses light at the condensing point of the condensing lens on the side opposite to the side facing the condensing lens of the light shielding body, and corrects the light transmitted through the light shielding body to substantially parallel light and emits the light. The light source according to claim 1, wherein the light source is disposed. A light-emitting diode chip is connected to a pair of leads, and the light emitted from the light-emitting diode chip is refracted in a direction in which the divergence angle is reduced and emitted from the connection portion to a surface opposite to the emission surface of the light-emitting diode chip. A light emitting diode molded by a molded body having a convex lens portion and a light emitting diode disposed on the light emitting side of the light emitting diode, out of the light emitted from the light emitting diode, directly from the light emitting diode chip toward the convex lens portion of the mold body A condensing lens that condenses the emitted light that is emitted and refracted in a direction in which the divergence angle is reduced by the convex lens portion, and a converging lens that is disposed across the condensing point of the condensing lens and is emitted from the light emitting diode. A light-shielding body that transmits the light condensed at the condensing point among the light transmitted through the condensing lens and blocks other light; The light-shielding body is disposed on the opposite side of the light-condensing lens from the side facing the condensing lens, and condenses light at the condensing point of the condensing lens and transmits the light-shielding body to substantially parallel light. A light source comprising a projection lens that emits;
A distance measuring device comprising: an optical sensor disposed on a side of the light source, receiving a return light emitted from a projection lens of the light source and reflected by a distance measuring object and outputting the signal. .   The optical sensor includes a plurality of photoelectric conversion elements arranged in a direction intersecting with an emission direction of light from a projection lens of a light source, is emitted from the projection lens, is reflected by a distance measuring object, and is reflected from the projection lens. Light returned to the optical sensor at an angle corresponding to the distance to the distance measuring object is received by the photoelectric conversion element at the incident point of the return light among the plurality of photoelectric conversion elements, and the signal is received. The distance measuring device according to claim 4, wherein the distance measuring device outputs the distance measuring device.

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