JP2013050368A - Automatic door opening/closing control sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of elements to be required for configuring a monitor region with a predetermined area in an optical automatic door opening/closing control sensor.SOLUTION: An automatic door opening/closing control sensor includes: a light emission part 10 having a light emitting element 11 for emitting light toward a monitor region set in the neighborhood of the gateway of an automatic door AD via a first lens 12; and a light reception part 20 having a light receiving element 21 for receiving reflection light from the monitor region via a second lens 22. The sensor emits emission light from the light emitting element 11 toward the monitor region with the use of the first lens 12 as spot light, receives the reflection light by the light receiving element 21 via the second lens 22, and outputs an opening/closing signal to the automatic door AD in response to the light reception amount. A prism 13 for allowing the spot light with the first lens 12 to be refracted in two different directions so as to be two spot lights is arranged on the light emitting surface side of the first lens 12, for example.

Description

  The present invention relates to an optical automatic door opening / closing control sensor comprising a combination of a light emitting element and a light receiving element, and more specifically, the number of elements required to form a monitoring area of a predetermined area is further reduced. The present invention relates to an automatic door opening / closing control sensor with good cost performance.

  Sensors for automatic door opening / closing control include ultrasonic, tread-pressure mat type, optical type by infrared irradiation (reflective type), radar type, etc. Optical sensors that are relatively inexpensive and easy to install Is generally adopted.

  As shown in FIG. 5, the optical sensor 1 is attached to the seamless door T of the automatic door AD, and a monitoring area SA composed of an aggregate of infrared spot lights SP is set on the floor surface F of the entrance / exit passage of the automatic door AD. To do. The optical sensor 1 may be attached to the ceiling surface above the invisible T.

  In this case, the spot light SP is included in the monitoring row L along the opening / closing direction of the automatic door AD (the direction of the arrow A in FIG. 5), and the monitoring area SA is usually composed of a plurality of monitoring rows L.

  In the example shown in FIG. 5, twelve spot lights SP are included in one monitoring row L, and six monitoring rows L1 to L6 are arranged in multiple rows in the stepping direction with respect to the automatic door AD (arrow B direction in FIG. 5). Is arranged.

  Referring to FIG. 6, the optical sensor 1 includes a light emitting unit 2 and a light receiving unit 3. In order to obtain 12 spot lights SP per monitoring row L, in this example, the light emitting unit 2 is provided with three light emitting elements 2a to 2c per monitoring row L, and the lens system thereof has a four-divided lens. 2d is used.

  6 shows only the light emitting elements 2a to 2c for one monitoring column L, but when the monitoring column L is six columns (L1 to L6) as shown in FIG. The light emitting elements 2 a to 2 c are arranged in six rows in a direction orthogonal to the paper surface of FIG. 6, and a total of 18 light emitting elements are used in the light emitting unit 2.

  On the other hand, the light receiving unit 3 is provided with three light receiving elements 3a to 3c for each monitoring row L in order to receive reflected light of 12 spot lights SP per monitoring row irradiated by the light emitting unit 2. In this lens system, a four-divided lens 3d is used.

  Similar to the light emitting unit 2 side, FIG. 6 shows only three light receiving elements 3a to 3c for one monitoring column L. However, as shown in FIG. In the case of L6), the light receiving elements 3a to 3c are arranged in six rows in a direction orthogonal to the paper surface of FIG. 6, and a total of 18 light receiving elements are used in the light receiving unit 3.

  In general, infrared light emitting diodes are used for the light emitting elements 2a to 2c, and photodiodes are used for the light receiving elements 3a to 3c. The four-divided lenses 2d and 3d are obtained by joining four convex lenses.

  According to the optical sensor 1, the infrared spot light SP is emitted from the light emitting elements of the light emitting unit 2 toward the monitoring area SA, and the reflected light is received by the corresponding light receiving elements on the light receiving unit 3 side. Because of the change in the amount of received light, an object existing in the monitoring area SA can be detected, and monitoring in units of the monitoring row L is also possible. For example, the moving direction of the object can also be detected. it can.

  By the way, in the installation site, when adjusting the width of the monitoring row L according to the opening / closing width of the door, the installation height of the optical sensor or the light reflector disposed in the vicinity of the monitoring area, the conventional optical sensor described above is used. 1 cannot be adjusted electrically. In addition, although it changes also with the installation height of the optical sensor 1, the diameter of one spotlight SP is about about 20-30 cm normally.

  Referring to FIG. 6, in the case of a three-light-emitting element and a four-divided lens, the spot light by light-emitting element 2a is 2ap, the spot light by light-emitting element 2b is 2bp, and the spot light by light-emitting element 2c is 2cp. This includes four groups of spot light groups “2ap, 2bp, 2cp” in order from the right.

  Therefore, for example, when the light emitting element 2a is electrically turned off to eliminate the spot light 2ap indicated by the white circle located at the rightmost side in the monitoring row L and narrow the width of the monitoring row L, the right side 4 indicated by the white circle is also displayed. The seventh, seventh, and tenth spot lights 2ap are also eliminated, and a so-called tooth-missing state occurs, which is not preferable in terms of detection accuracy. This is the same even if the light reception signal on the light receiving element 3a side corresponding to the light emitting element 2a is electrically invalidated, for example.

  Therefore, conventionally, as shown in FIG. 6, for example, a light-shielding body 4 such as a light-shielding plate or a light-shielding seal as a mask is provided in a predetermined portion of the four-segment lens 2 d on the light emitting unit 2 side. The width is adjusted.

  However, careful attention and effort are required to accurately arrange the light shield 4 so that light does not leak. In addition to being unfavorable in appearance, there is a problem that peeling may occur due to deterioration of the adhesive or pressure-sensitive adhesive used for the light-shielding body 4 due to deterioration over time.

  Therefore, in order to solve this point, the applicant of the present invention in JP-A No. 2004-151867 makes it possible to use two adjacent spot lights from the same light-emitting element among the plurality of spot lights included in the monitoring row. An invention has been proposed in which the width of the monitoring column can be adjusted in a specific manner, and this will be described with reference to FIG.

  In the invention described in Patent Document 1, a two-divided lens is basically used as the lens system. FIG. 7A shows an arrangement relationship between two elements (two light emitting elements 2a and 2b) and a two-divided lens 2e. The two-divided lens 2e includes a left convex lens 2eL and a right convex lens 2eR as two convex lenses, and the centers of the lenses are CL and CR.

  The light emitting elements 2a and 2b are arranged symmetrically with respect to a virtual center line X that bisects the monitoring row L, and the convex lenses 2eL and 2eR are also arranged symmetrically. Here, the light emitting elements 2a and 2b are arranged so that the relationship of W1> W2 is established, where W1 is the pitch between the light emitting elements 2a and 2b and W2 is the distance between the centers CL and CR of the lenses.

  Since it is a two-element, two-divided lens, four spot lights are irradiated in the monitoring row L, but according to the invention described in Patent Document 1, the light emitted from the left light-emitting element 2a is adjacent to each other. The two aligned spot lights 2ap and 2ap are irradiated to the right side of the monitoring row L.

  On the other hand, the light emitted from the right light emitting element 2b is irradiated to the right side of the monitoring row L as two adjacently arranged spot lights 2bp and 2bp. Therefore, the width of the monitoring column L can be halved by electrically turning off one of the light emitting elements 2a and 2b.

  FIG. 7B shows a combination example of three elements (three light emitting elements 2a to 2c) and a two-divided lens. In this example, the central light emitting element 2b is arranged on a virtual center line X that bisects the monitoring row L, and the other two light emitting elements 2a and 2c are arranged symmetrically with an inter-element pitch W1. The The two-divided lens 2e is arranged in the same manner as in FIG.

  In this case, the light emitted from the central light emitting element 2b is converted into two spot lights 2bp and 2bp by the two-divided lens 2e, and each of them is irradiated to the left side and the right side of the monitoring row L as adjacent horizontal lines. The

  On the other hand, the light emitted from the left light-emitting element 2a is irradiated as two aligned spot lights 2ap and 2ap adjacent to the right side of one spot light 2bp, and is emitted from the right light-emitting element 2c. Is irradiated as two aligned spot lights 2cp and 2cp adjacent to the left side of the other spot light 2bp.

  Therefore, by electrically turning off one of the light emitting elements 2a and 2b, the width of the monitoring row L can be narrowed by the left and right spot lights, and both the light emitting elements 2a and 2b are electrically connected. By setting the light-off state, the width of the monitoring row L can be made to include only the central two spot lights 2 bp and 2 bp. 7A and 7B, the element is a light emitting element, but the element may be a light receiving element.

  7A and 7B, the adjustment width of the monitoring row L is equivalent to two spot light, but another patent document 2 proposed by the present applicant is disclosed in Patent Document 2. According to this, by using a technique for moving the two-divided lens 2e along the arrangement direction of the light emitting elements by the center CL and CR distance W2 between the lenses, the adjustment width of the monitoring row L is reduced to one spot light. Can be in minutes.

Japanese Patent No. 4011785 JP 2010-276511 A

  However, as in Patent Documents 1 and 2, when using a two-divided lens in the lens system, the number of elements may have to be increased. For example, as shown in FIG. 6, in the case of 12 spot lights per monitoring row L, three elements are sufficient for a four-divided lens, but six elements are required when a two-divided lens is used. .

  Further, in the case of the two-divided lens in Patent Documents 1 and 2, as shown in FIG. 7, it is necessary to bring the lens centers CL and CR close to the center of the two-divided lens, so that the lens area cannot be used effectively. Sometimes.

  Therefore, in the case of 12 spot lights per monitoring row L, according to the invention described in Patent Document 2, the two-divided lens is 2 on the light emitting side and the light receiving side, respectively, from the relationship between the half-value angle of the element and the lens efficiency. A total of four lenses are required (see FIG. 1 of Patent Document 2).

  Accordingly, an object of the present invention is to reduce the number of elements required to form a monitoring area of a predetermined area in an optical automatic door opening / closing control sensor comprising a combination of a light emitting element and a light receiving element. The object is to provide an automatic door opening / closing control sensor with good cost performance.

  In order to solve the above-mentioned problem, the present invention provides a light-emitting unit having a light-emitting element that irradiates light through the first lens toward the monitoring area, and a vicinity of the entrance / exit of the automatic door. A light receiving portion having a light receiving element for receiving the reflected light through the second lens, and emitting the emitted light from the light emitting element as spot light toward the monitoring area by the first lens. In the automatic door opening / closing control sensor that receives the spot light reflected by the light through the second lens by the light receiving element and outputs an opening / closing signal to the automatic door based on the received light amount, On either the light exit surface side of one lens or the reflected light receiving surface side of the second lens of the light receiving unit, the spot light is refracted in two different directions on one surface, and two spots are scattered. Has a prism surface formed in cross-section triangular to light, the other surface is characterized in that a prism is disposed is smooth.

  In the present invention, the prism is disposed on the light emitting surface side of the first lens of the light emitting unit, the first lens is a monocular convex lens, and the light emitting unit emits n (n is an integer of 1 or more) light emission. In the aspect provided with the element, 2n spot lights are irradiated to the monitoring area by the prism.

  The prism is disposed on the light exit surface side of the first lens of the light emitting unit, and a split lens including m convex lenses (m is an integer of 2 or more) is used for the first lens. In an aspect including n (n is an integer of 1 or more) light emitting elements, 2 (m × n) spot lights are irradiated onto the monitoring area by the split lens and the prism.

  Thus, in the aspect in which the prism is disposed on the light emitting surface side of the first lens of the light emitting unit, a two-divided lens including two convex lenses is used for the second lens on the light receiving unit side, The light receiving unit includes a plurality of light receiving elements, and the relationship between W1> W2 is established so that the distance between the light receiving elements is W1, the distance between the lens centers of the two-divided lenses is W2, and W1> W2. Each light receiving element is preferably arranged with respect to the divided lens.

  On the other hand, in the aspect in which the prism is disposed on the reflected light receiving surface side of the second lens of the light receiving unit, a two-divided lens including two convex lenses is used for the first lens on the light emitting unit side. The light emitting section includes a plurality of light emitting elements, the pitch between the light emitting elements is W1, the distance between the lens centers of the two-divided lens is W2, and the relationship of W1> W2 is established. It is preferable that each light emitting element is disposed with respect to the two-divided lens.

  Further, in the aspect in which the prism is disposed on the light emitting surface side of the first lens of the light emitting unit, a two-divided lens including two convex lenses is used for the first lens on the light emitting unit side, and the light emitting unit In the two-divided lens, a relationship of W1> W2 is established, where a pitch between the light-emitting elements is W1 and a distance between the lens centers of the two-divided lens is W2. On the other hand, each light emitting element may be arranged.

  According to the present invention, on the light exit surface side of the first lens provided in the light emitting section, the prism surface formed in a triangular wave shape in cross section to refract spot light in two different directions on one surface to form two spot lights. By providing the prism having the other surface and smooth, the number of elements on the light emitting unit side can be reduced. Similarly, by arranging a prism on the reflected light receiving surface side of the second lens provided in the light receiving unit, the number of elements on the light receiving unit side can be reduced.

  In addition, since the spot light that has passed through the first lens is directed in two directions by the prism, when using a two-divided lens for the first lens, the distance between the lens centers may be increased, so the lens area is more effective. It can be used for.

  When a prism is arranged on the light emitting unit side, a two-divided lens is used on the light receiving unit side and the number of elements is plural. When a prism is arranged on the light receiving unit side, a two-divided lens is arranged on the light emitting unit side. Is used, and the number of elements is plural, the pitch between the elements is W1, and the distance between the lens centers of the split lens is W2, and W1> W2, so that it is electrically in one spot light unit or two spot light units. The width of the monitoring column can be adjusted.

It is a schematic diagram which shows 1st Embodiment of this invention, (a) is a front view, (b) is a top view which shows the monitoring row | line | column on a floor surface. Sectional drawing which shows the prism used by this invention. It is a schematic diagram which shows 2nd Embodiment of this invention, (a) is a front view, (b) is a top view which shows the monitoring row | line | column on a floor surface. It is a schematic diagram which shows 3rd Embodiment of this invention, (a) is a front view, (b) is a top view which shows the monitoring row | line | column on a floor surface. The perspective view which shows the general example of the monitoring area near the entrance / exit of the automatic door set by the sensor for automatic door opening / closing control. The schematic diagram which shows the structure of the prior art example which sets the monitoring area of FIG. (A) (b) The schematic diagram which shows two examples of the arrangement | positioning relationship of a 2 split lens and an element which can adjust a monitoring area width electrically.

  Next, some embodiments of the present invention will be described with reference to FIGS. 1 to 4, but the present invention should not be construed as being limited to these embodiments.

  First, referring to FIG. 1A, an automatic door opening / closing control sensor (hereinafter sometimes simply referred to as “automatic door sensor”) 1A according to the first embodiment will be described. Then, as the simplest configuration example, both the light emitting unit 10 and the light receiving unit 20 have one element per monitoring row L (see FIG. 1B for the monitoring row).

  That is, the light emitting unit 10 includes one light emitting element 11 a as the light emitting element 11, and the light receiving unit 20 includes one light receiving element 21 a as the light receiving element 21. An infrared light emitting diode may be used for the light emitting element 11, and a light receiving diode may be used for the light receiving element 21.

  As shown in FIG. 1B, when four monitoring rows L are set in the depression direction of the automatic door AD, there are four light emitting elements 11a and light receiving elements 21a in the direction perpendicular to the paper surface. Be placed.

  The light emitting unit 10 is provided with a first lens 12 as a lens system for making the light emitted from the light emitting element 11a toward the floor surface F into a spot light. In the first embodiment, the first lens 12 is provided. Is a monocular lens (monocular convex lens) 12a.

  In the combination of one light emitting element 11a and the monocular lens 12a, only one spot light is irradiated on the floor surface F. For example, when two spot lights are irradiated on the floor surface F using the monocular lens 12a Requires two light emitting elements 11a.

  Therefore, in the first embodiment, the light emitting surface of the monocular lens 12a is used in order to irradiate two spot lights on the floor surface F while being a combination of the single light emitting element 11a and the monocular lens 12a. A prism 13 is arranged on the side.

  As shown in FIG. 2, the prism 13 has a prism surface 131 formed in a triangular wave shape in cross section that refracts the spot light in two different directions and divides (divides) the spot light into two spot lights on one surface 13a. The other surface 13b is a prism formed smoothly.

  In addition, as shown in FIG. 2, by making the cross-sectional shape of the prism surface 131 into an isosceles triangular wave shape, the spot light can be refracted in two different directions symmetrically and divided into two spot lights. When the left and right refraction angles are made different, the inclination angles of one inclined surface and the other inclined surface may be made different. However, an inclined surface having an angle perpendicular to or greater than that of the other smooth surface 13b is excluded.

  According to the first embodiment, the light emitted from the light emitting element 11a is divided into two spot lights by the prism 13 while being a combination of one light emitting element 11a and the monocular lens 12a. Two spot lights 11a-1 and 11a-2 are irradiated into the row L.

  On the other hand, the second lens 22 on the light receiving unit 20 side uses a two-divided lens 22a formed by joining two convex lenses, whereby spot lights 11a-1 and 11a-2 on the floor surface F are used. Is received by one light receiving element 21a through the two-divided lens 22a.

  Next, the automatic door sensor 1B according to the second embodiment will be described with reference to FIG. In the second embodiment, unlike the first embodiment, in order to obtain four spot lights by one light emitting element 11a, a two-segment lens 12b is used for the first lens 12 on the light emitting unit 10 side, and the light receiving unit 20 On the side, in order to receive the four spot lights through the two-divided lens 22a, another light receiving element 21b is added in addition to the light receiving element 21a.

  According to this, the light emitted from the light emitting element 11a is divided into two spot lights by the two-divided lens 12b, and these spot lights are further divided into two by the prism 13. Four spot lights 11 a-1, 11 a-2, 11 a-3, and 11 a-4 are irradiated per monitoring row L.

  On the light receiving unit 20 side, the reflected light of each spot light is received by the light receiving elements 21a and 21b via the two-divided lens 22a. In this case, the width of the monitoring row L can be adjusted electrically. Therefore, it is preferable that W1> W2, where the inter-element pitch of the light receiving elements 21a and 21b is W1 and the distance between the lens centers of the two-divided lens 22a is W2.

  That is, by setting W1> W2, as described in Patent Document 1, for example, two adjacent spot lights 11a-1 and 11a-2 are incident on one light receiving element 21b and adjacent to each other. The two spot lights 11a-3 and 11a-4 are incident on the other light receiving element 21a.

  Therefore, by treating one of the light receiving elements 21a and 21b as invalid, for example, the width of the monitoring row L can be reduced to almost half. In addition, by applying the adjustment method described in Patent Document 2, the width of the monitoring row L can be narrowed by one spot light unit.

  Further, according to the second embodiment, the spot light passing through the two-divided lens 12b on the light emitting unit 10 side is further divided into two by the prism 13, so that the distance between the lens centers of the two-divided lens 12b is increased. Therefore, the lens area can be utilized more effectively.

  Next, an automatic door sensor 1C according to the third embodiment will be described with reference to FIG. In the third embodiment, as shown in FIG. 4A, in order to obtain 12 spot lights per monitoring row L, the light emitting unit 10 includes three elements (three light emitting elements 11a to 11c), a two-divided lens 12b, A combination of prisms 13 is used.

  That is, the respective emitted lights from the three light emitting elements 11a to 11c are made into 6 spot lights by the two-divided lens 12b, and these 6 spot lights are further divided into two by the prism 13 to obtain 12 spot lights.

  The six spot lights divided by the two-divided lens 12b are the spot lights 11a-1 and 11a-2 from the light emitting element 11a, the spot lights 11b-1 and 11b-2 from the light emitting element 11b, and the light emitting element 11c. Spot lights 11c-1 and 11c-2.

  Here, as shown in FIG. 4A, when the light emitting unit 10 is arranged on the center line X that bisects the monitoring row L into left and right regions, the six spots divided by the two-divided lens 12b. The light is distributed to the left region LL and the right region LR of the monitoring row L in the same order.

  In the third embodiment, the pitch between the light emitting elements 11a, 11b, and 11c on the light emitting unit 10 side is W1, and the distance between the lens centers of the split lens 12b is W2, and W1> W2.

  Thereby, the arrangement order of the 6-spot light in the monitoring row L by the two-divided lens 12b is, for example, 11c-1, 11c-2; 11b-1, 11b-2; 11a-1, 11a-2 from the left. In addition, two spot lights from the same light emitting element are adjacent to each other, and these spot lights are distributed by the prism 13 into the left region LL and the right region LR of the monitoring row L in the same order.

  Regarding the light receiving unit, in the third embodiment, among the 12 spot lights irradiated from the light emitting unit 10 to the monitoring row L, the first light receiving the reflected light of the 6 spot light irradiated to the left region LL of the monitoring row L is received. The light receiving unit 20 </ b> L and the second light receiving unit 20 </ b> R that receive the reflected light of the 6-spot light irradiated to the right region LR of the monitoring row L are provided.

  Each of the first light receiving unit 20L and the second light receiving unit 20R includes a combination of three elements (three light receiving elements 21a to 21c) and a two-divided lens 22a, and is disposed at a predetermined distance on both sides of the light emitting unit 10. The

  In the third embodiment, as in the second embodiment, the pitch between the light receiving elements 21a, 21b, and 21c is W1, the distance between the lens centers of the two-divided lens 22a is W2, and W1> W2. As a result, the reflected light of two adjacent spot lights is received by one of the light receiving elements, so that the output of the light receiving element is treated as, for example, invalid, so that the width of the monitoring row L is in units of two spot lights. It can be narrowed.

  In addition, by applying the adjustment method described in Patent Document 2, the width of the monitoring row L can be narrowed by one spot light unit.

  Further, by using the prism 13 on the light emitting unit 10 side, the number of light emitting elements can be reduced to half. As an example, as shown in FIG. 4B, when six monitoring rows L are formed in the stepping direction of the automatic door AD, it is assumed that a two-divided lens is used. 6 × 6 = 36 light-emitting elements are used in total, but according to the present invention, three light-emitting elements may be used for one monitoring column L, so that 3 × 6 = 18 in total. One light emitting element may be used, and the light emitting element to be used can be cut in half.

  In addition, the number of lenses to be used may be such that a single two-divided lens 12b is provided in the light emitting unit 10 and a single two-divided lens 22a is provided in each of the light receiving units 20L and 20R. be able to.

  In the third embodiment, the pitch between the light emitting elements 11a, 11b, and 11c on the light emitting unit 10 side is W1, and the distance between the lens centers of the split lens 12b is W2, and W1> W2. , W1 <W2. That is, W1> W2 is not necessarily required on the side where the prism 13 is disposed.

  In the third embodiment, the positions of the light emitting unit 10 and the light receiving unit 20 may be interchanged as shown by the chain line frame in FIG. That is, the light receiving unit 20 may be arranged in the center and the light emitting units 10L and 10R may be arranged on both sides thereof. In this case, the number of light receiving elements of the light receiving unit 20 can be reduced to half.

DESCRIPTION OF SYMBOLS 1A, 1B, 1C Automatic door sensor 10 Light emission part 11a, 11b, 11c Light emission element 12 1st lens 12a Monocular lens 12b Two split lens 13 Prism 20 Light reception part 21a, 21b, 21c Light reception element 22 2nd lens 22a Two split lens AD Automatic door L Monitoring line

Claims (6)

The vicinity of the entrance / exit of the automatic door is a monitoring area, a light emitting unit having a light emitting element that emits light toward the monitoring area through the first lens, and reflected light from the monitoring area is received through the second lens. A light receiving portion having a light receiving element, and irradiating light emitted from the light emitting element toward the monitoring area as spot light by the first lens, and reflecting the spot light reflected in the monitoring area to the second In an automatic door opening / closing control sensor that receives light by the light receiving element through a lens and outputs an opening / closing signal to the automatic door based on the amount of light received,
Either one of the light emitting surface side of the first lens of the light emitting unit or the reflected light receiving surface side of the second lens of the light receiving unit is configured to refract the spot light in two different directions on one surface. An automatic door opening / closing control sensor characterized in that a prism having a prism surface formed in a triangular wave shape as a spot light and having the other surface smooth is disposed.   The prism is disposed on the light emitting surface side of the first lens of the light emitting unit, the first lens is a monocular convex lens, and the light emitting unit includes n (n is an integer of 1 or more) light emitting elements, 2. The automatic door opening / closing control sensor according to claim 1, wherein 2n spot lights are irradiated to the monitoring area by the prism. 3.   The prism is arranged on the light emitting surface side of the first lens of the light emitting unit, a split lens including m (m is an integer of 2 or more) convex lenses is used for the first lens, and the number of the light emitting units is n. 2. The light emitting element (n is an integer of 1 or more) is provided, and 2 (m × n) spot lights are irradiated onto the monitoring area by the split lens and the prism. Automatic door opening / closing control sensor.   A two-divided lens including two convex lenses is used for the second lens on the light-receiving unit side. The light-receiving unit includes a plurality of light-receiving elements, and the pitch between the light-receiving elements is W1, and the two-divided lens is used. 4. The automatic door opening / closing control sensor according to claim 2, wherein the distance between the lens centers is W2, and W1> W2.   The prism is disposed on the reflected light receiving surface side of the second lens of the light receiving unit, a two-divided lens including two convex lenses is used for the first lens on the light emitting unit side, and a light emitting element provided in the light emitting unit is provided. 2. The automatic door opening / closing control according to claim 1, wherein a plurality of light emitting elements each have a pitch of W1 and a distance between lens centers of the two-divided lens is W2, and W1> W2. Sensor.   The first lens on the light emitting unit side is a two-divided lens including two convex lenses, the light emitting unit includes a plurality of light emitting elements, and the pitch between the light emitting elements is W1, and the two divided lenses are used. 6. The automatic door opening / closing control sensor according to claim 1, wherein W <b> 1> W <b> 2, where W <b> 2 is a distance between lens centers.

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