JP2010276511A - Sensor for automatic door and method for regulating monitoring area thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To regulate the width of a monitoring area in accordance with a placement environment by a unit of one spot light in a simple structure. <P>SOLUTION: This sensor for an automatic door includes a light emitting section 20 having a plurality of light emitting elements 21 that emit infrared spot lights via a first lens 22 in at least one line arrangement toward a monitoring area set at a portion in the vicinity of a doorway of an automatic door, and a light receiving section having a light reception element for receiving reflection light from the monitoring area via a second lens. When an inter-element pitch between the light emitting elements 21 is represented by W1 and a lens inter-center distance of two-divisional lens of the first lens 22 having two convex lenses is represented by W2, the light emitting elements 21 and the first lens 22 at a light emitting section 20 side are arranged so as to satisfy an expression: W1>W2. The first lens 22 can be moved along the arrangement direction of the light emitting elements 21 by the lens inter-center distance W2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a reflective automatic door sensor which is attached to an invisible portion or a ceiling portion of an automatic door and uses a vicinity of the entrance / exit of the automatic door as a monitoring area, and a method for adjusting the monitoring area.

  Sensors for automatic doors include ultrasonic type, tread pressure mat type for detecting weight, and reflective type by infrared rays. Each has advantages and disadvantages, but the monitoring area can be set clearly and the product price is relatively low. Since it is inexpensive, a reflective sensor is generally employed.

  The present applicant has proposed, as Patent Document 1, an automatic door sensor that is a reflection type and has an area width adjustment function of a monitoring area. The configuration and operation will be described with reference to FIGS.

  As shown in FIG. 7, since the automatic door sensor 1 is of a reflective type, the automatic door sensor 1 includes a light emitting unit 20 on the transmitting side and a light receiving unit 30 on the receiving side as a basic configuration.

  The light emitting unit 20 and the light receiving unit 30 are arranged side by side in a housing (lens box) 10A arranged in an invisible part of the automatic door or near the ceiling. The housing 10 </ b> A is provided with a first lens 22 for the light emitting unit 20 and a second lens 32 for the light receiving unit 30.

  In this example, each of the light emitting unit 20 and the light receiving unit 30 includes three elements (light emitting elements 21a to 21c and light receiving elements 31a to 31c), and the light emitting elements 21a to 21c and the light receiving elements 31a to 31c are respectively housings. It is mounted on the circuit board 11 in the body 10A at equal intervals in a horizontal row (left-right direction in FIG. 7).

  In the following description, when it is not necessary to distinguish the light emitting elements 21a to 21c, the reference numeral is 21, and similarly, when it is not necessary to distinguish the light receiving elements 31a to 31c, the reference numerals are used. Is 31. An infrared light emitting diode is used for the light emitting element 21, and an infrared light receiving diode is used for the light receiving element 31.

  The first lens 22 on the light emission side is a two-divided lens that integrally includes two convex lenses 22L and 22R. Similarly, the second lens 32 on the light receiving unit side is also provided with two convex lenses 32L and 32R. A two-divided lens that is integrally included is used.

  The first lens 22 is disposed at a central portion of the light emitting unit 20, that is, at an optical axis position of the light emitting element 21b disposed at the center, so as to be substantially orthogonal to the optical axis. Similarly, the second lens 32 is also arranged at a central portion of the light receiving unit 30, that is, at the optical axis position of the light receiving element 31b arranged at the center so as to be substantially orthogonal to the optical axis.

  In the invention described in Patent Document 1, the pitch between the light emitting elements 21a to 21c and the light receiving elements 31a to 31c is W1, and the lens center distance between the lens centers CL and CR of the first lens 22 and the second lens 32 is set. Is W2, and the light emitting element 21 and the first lens 22, and the light receiving element 31 and the second lens 32 are arranged such that W1> W2.

  According to this, as schematically shown in FIG. 8A, six spot lights are directed from the light emitting elements 21a to 21c to the monitoring area A on the floor via the first lens (two-divided lens) 22. Although it is irradiated, since W1> W2, two spot lights irradiated from one light emitting element 21 are adjacent to each other.

  That is, the order of arrangement of the spot light in the monitoring area A is as follows, from right to left in FIG. 8A: spot light SA1, SA2 by the light emitting element 21a; spot light SB1, SB2 by the light emitting element 21b; It becomes order of light SC1 and SC2. In the actual monitoring area, the monitoring area A is provided in multiple rows in the stepping direction with respect to the automatic door, with the row as a unit.

  In this way, since the two spot lights irradiated from one light emitting element 21 are adjacent to each other, as shown in FIG. 8B, for example, the right light emitting element 21c is turned off (electrically erased). Thus, since the spot lights SC1 and SC2 are eliminated, the width of the monitoring area A can be reduced by the two spot lights.

Patent No. 4011785

  However, the width of the monitoring area A can be narrowed in units of two spot light, and cannot be narrowed in units of one spot light. Incidentally, the diameter of the spot light is about 20 to 30 cm.

  As another method for narrowing the width of the monitoring area A, there is a method in which a part of the lens on the light emitting side and / or the light receiving side is shielded with a mask. Adjustment in units of spot light is accompanied by considerable work difficulties.

  Further, according to the method in which the light-emitting side and / or the light-receiving side lens is a monocular lens and the light-emitting elements and light-receiving elements are arranged in the number corresponding to the spot light, one element is electrically erased, so The monitoring area width can be adjusted in units.

  However, this requires a large number of elements on both the light emitting unit side and the light receiving unit side, which is not preferable in terms of cost. Moreover, since many elements are arranged side by side, there is a problem that the number of columns in the step-down direction and the adjustment method are sacrificed.

  As another method, there is a method of rotating the lens boxes (unit housings) on the light emitting unit side and the light receiving unit side in directions toward or away from each other. According to this, the width of the monitoring area can be adjusted in units of one spot light.

  However, since the control unit and the lens box are configured independently, the cost is high, and the sensor itself becomes large in order to allow the rotation of each lens box. Furthermore, there are problems such as an increase in the number of parts and difficulty in assembly.

  Accordingly, an object of the present invention is to make it possible to adjust the monitoring area in units of one spot light according to the installation environment of the sensor, with a simple configuration.

  In order to solve the above-described problems, the present invention has a plurality of light emitting elements that irradiate infrared spot lights in at least one line through a first lens toward a monitoring area set in the vicinity of an entrance / exit of an automatic door. A light-receiving unit including a light-emitting unit and a light-receiving unit that receives reflected light from the monitoring area via a second lens, wherein the pitch between the light-emitting elements is W1, and the first lens has two convex lenses. In the automatic door sensor in which each of the light emitting elements and the first lens on the light emitting part side are arranged so as to satisfy W1> W2, where the distance between the lens centers is W2, and the distance between the lens centers is W2. The first lens side can be moved by the distance W2 between the lens centers along the direction in which the light emitting elements are arranged.

  According to a preferred aspect of the present invention, there is provided lens movement guide means for guiding the movement amount of the first lens to the distance W2 between the lens centers.

  In the present invention, the light receiving section includes the same number of light receiving elements as the light emitting elements, and the second lens is a two-divided lens having a lens center distance W2 as in the first lens. In addition, it is preferable that the lens can be moved by the distance W2 between the lens centers along the direction in which the light receiving elements are arranged.

  Further, instead of the first lens, the light emitting element side may be movable in units of the inter-element pitch W1 along the center distance direction of the first lens.

  Further, in the present invention, a light-emitting unit having a plurality of light-emitting elements that irradiate infrared spot light in at least one line through a first lens toward a monitoring area set near an entrance of an automatic door, A light receiving unit having the same number of light receiving elements that receive reflected light from the monitoring area via the second lens, and the pitch between the light emitting elements and the light receiving elements is W1, and the first Both the lens and the second lens are two-divided lenses integrally including two convex lenses, and the distance between the lens centers is W2, and W1> W2 is established on the light emitting unit side and the light receiving unit side. In the method for adjusting the monitoring area width of the sensor, the first lens side is movable along the direction in which the corresponding light emitting elements are arranged, and the first lens is moved to the light emitting elements. The position arranged at the center of the row is set as the initial first position, and the first lens is moved from the initial position toward one of the arrangement directions of the light emitting elements by the lens center distance W2. The first position is set to the second position, and the first lens is moved from the first position to the second position, thereby reducing the monitoring area width by one spot light, and the first lens is moved to the second position. By returning from the second position to the first position and turning off one of the light emitting elements located outside the light emitting elements, the second step of narrowing the monitoring area width by two spot lights is repeated. Also included is a method for adjusting the monitoring area width of the automatic door sensor, wherein the monitoring area width is narrowed by one spot light.

  According to the present invention, there is also provided a light emitting unit having a light emitting element for irradiating at least one line of infrared spot light through a first lens toward a monitoring area set near an entrance of an automatic door, and the monitoring area. In a method for adjusting a monitoring area of an automatic door sensor comprising a light receiving portion having a light receiving element for receiving reflected light from the second lens, both the first lens and the second lens are arranged in the same direction. And the adjustment method of the monitoring area of the sensor for automatic doors characterized by shifting the position of the said monitoring area in the same direction by moving the same distance.

  According to the present invention, when the inter-element pitch of each light-emitting element is W1, and the distance between the lens centers of the two-divided lens that is the first lens is W2, each light-emitting element and the first lens on the light-emitting portion side are W1> W2. In the state of being arranged so as to satisfy the above, by moving the first lens side by the distance W2 between the lens centers along the arrangement direction of the respective light emitting elements, the spot light train irradiated to the monitoring area is changed to one spot light. It can be moved by minutes. Thereby, since the reflected light does not enter one of the light receiving elements on the light receiving unit side, the width of the monitoring area is substantially narrowed by one spot light. Further, by turning off (electrically erasing) the light emitting elements arranged outside the light emitting elements at the initial position before moving the first lens, the width of the monitoring area can be narrowed by two spot lights. . In this way, after moving the first lens to narrow the width of the monitoring area by one spot light, the first lens is returned to the original initial position, and the light emitting elements arranged outside the light emitting elements are turned off. By repeating this, the width of the monitoring area can be reduced by one spot light.

  Further, the position of the monitoring area can be shifted in the same direction by moving both the first lens on the light emitting unit side and the second lens on the light receiving unit side in the same direction and the same distance.

Sectional drawing which shows typically the structure of the sensor for automatic doors concerning embodiment of this invention. (A) Sectional drawing which shows the lens movement guide means with which the said sensor for automatic doors is equipped, (b) Sectional drawing which shows the state which moved the lens. (A)-(c) The schematic diagram for demonstrating the structure and effect | action by the side of the light emission part of the said sensor for automatic doors. (A)-(c) The schematic diagram for demonstrating the aspect which narrows the monitoring area width | variety for every 1 spot light in the said sensor for automatic doors. (A)-(c) The schematic diagram for demonstrating the aspect which narrows the monitoring area width | variety for every 1 spot light in the said automatic door sensor following FIG. The schematic diagram for demonstrating another aspect which narrows the monitoring area width in the said sensor for automatic doors. The schematic diagram which shows the structure of the sensor for automatic doors which concerns on a prior art example. (A), (b) The schematic diagram for demonstrating an effect | action of the sensor for automatic doors of the said prior art example.

  Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 6, but the present invention is not limited to this. In the description of this embodiment, the same reference numerals are assigned to components that do not need to be changed from the conventional example described in FIGS.

  As shown in FIG. 1, in the automatic door sensor 1A according to this embodiment, two pairs of light emitting / receiving units, that is, a pair of a left light emitting unit 20L and a left light receiving unit 30L, a right light emitting unit 20R and a right side And a pair of light receiving portions 30R. These pairs are arranged symmetrically with respect to the center line L of the sensor casing.

  The light emitting unit 20L and the light emitting unit 20R include a light emitting element 21 and a first lens 22 corresponding thereto, like the light emitting unit 20 in the automatic door sensor 1 described with reference to FIG. Also in this example, the light emitting element 21 includes three elements 21a to 21c made of infrared light emitting diodes, and the first lens 22 is a two-divided lens integrally including two convex lenses 22L and 22R.

  The light receiving unit 30L and the light receiving unit 30R include a light receiving element 31 and a second lens 32 corresponding to the light receiving element 31, like the light receiving unit 30 in the automatic door sensor 1 described with reference to FIG. Also in this example, the light receiving element 31 includes three elements 31a to 31c made of infrared light receiving diodes, and the second lens 32 is a two-divided lens integrally including two convex lenses 32L and 32R.

  Also in this embodiment, as shown in FIG. 3A, the pitch between the elements of the light emitting section 20L and the light emitting section 20R is W1, the distance between the lens centers of the first lenses 22 is W2, and W1> W2. The light emitting elements 21a to 21c are arranged so as to satisfy the above. The same applies to the light receiving portions 30L and 30R.

  The horizontal direction of the light emitting elements 21a to 21c is H1, the distance direction between the lens centers of the first lens 22 is H2, and the first lens 22 has a distance direction H2 between the lens centers with respect to the horizontal direction H1 of the light emitting elements 21a to 21c. At a position where the midpoint between the lens centers CL and CR intersects the vertical bisector of the line connecting the outer light emitting elements 21a and 21c, that is, the optical axis of the central light emitting element 21b. Be placed. This position is the default position, that is, the initial first position. The second lenses 32 on the light receiving units 30L and 30R side are similarly arranged.

  In this embodiment, the first lens 22 on the light emitting units 20L and 20R side can move only along the lens center distance direction H2, and the amount of movement is the lens center distance W2.

  Therefore, the automatic door sensor 1 </ b> A includes lens movement guide means 23 that guides the movement of the first lens 22.

  As shown in FIG. 2A, the lens movement guide means 23 may be, for example, a horizontally long flat box in which the first lens 22 is housed so as to be movable along the lens center distance direction H2. On the inner surface, a central engaging claw 23C that engages with the recess 221 of the joint portion of the first lens 22 to hold the first lens 22 in the initial first position, and the first lens 22 is moved to the right end position. A right end engaging claw 23R that holds the first lens 22 at a left end moving position is formed.

  The distance between the center engaging claw 23C and the right end engaging claw 23R and the distance between the center engaging claw 23C and the left end engaging claw 23L are equal to the lens center distance W2. Each of the engaging claws 23C, 23R, and 23L engages with the recess 221 of the first lens 22 with an appropriate click force. FIG. 2B shows a state where the first lens 22 is moved to the right end position.

  In this embodiment, the first lens 22 is moved manually. However, the first lens 22 can be moved by a driving means such as a solenoid or a motor. In this case, the guide rail for the first lens 22 is also possible. Etc. may be provided.

  As shown in FIG. 3A, in this embodiment, the light emitting unit 20 includes three light emitting elements 21a to 21c, the first lens 22 is a two-divided lens, and W1> W2. Therefore, the arrangement order of the spot lights in the monitoring area A is as follows. From right to left in FIG. 3A, the spot lights SA1 and SA2 by the light emitting element 21a; the spot lights SB1 and SB2 by the light emitting element 21b; The spot lights SC1 and SC2 are in this order.

  The reflected light at the monitoring area A of these spot lights SA1, SA2, SB1, SB2, SC1, and SC2 is received by the corresponding light receiving elements 31a to 31c via the second lens 2 on the light receiving unit 30 side. .

  When the first lens 22 is moved to the right end side by the distance W2 between the lens centers from the initial state of FIG. 3A, as shown in FIG. 3B, the spot lights SA1, SA2, SB1, SB2, SC1, SC2 Are shifted to the right by one spot light.

  As a result, the spot light SA1 deviates from the light receiving area (the area extending from SA1 to SC2 in FIG. 3A) by the light receiving elements 31a to 31c, so that the monitoring area A is substantially narrowed by one spot light.

  Further, as shown in FIG. 3C, when the outer side, for example, the light emitting element 21c is turned off (electrically erased) in a state where the first lens 22 is in the initial first position, the two spot lights SC1 on the left side. , SC2 is eliminated, and the monitoring area A is narrowed by two spot lights.

  In the present invention, the area width of the monitoring area A is narrowed as described above. The specific procedure will be described with reference to FIGS.

  First, as shown in FIG. 4A, assuming that the object to be monitored is a double door sliding door type door including two door plates TL and TR, according to the automatic door sensor 1A in FIG. Six spot lights are irradiated along the left door plate TL by 20L, and six spot lights are irradiated along the right door plate TR by the right light emitting unit 20R. Individual spot lights are included.

  For convenience of explanation, spot light from the left light emitting unit 20L is given L at the end of the reference symbol, and spot light from the right light emitting unit 20R is given R at the end of the reference symbol. For the light receiving portions 30L and 30R, both the second lens 32 is fixed at the initial first position, and the light receiving area covers the entire monitoring area A in FIG. To do.

  First, in order to narrow the both ends of the monitoring area A by one spot light, in FIG. 2, the first lens 22 of the left light emitting portion 20L is moved to the initial first position (the engaging claw 23C at the center of FIG. 2A). From the engagement position) to the right end position (the engagement position by the engagement claw 23R at the right end in FIG. 2B).

  On the other hand, the first lens 22 of the right light emitting unit 20R is moved from the initial first position to the left end position (engagement position by the left end engagement claw 23L).

  Accordingly, as shown in FIG. 4B, the spot light train (SA1L, SA2L, SB1L, SB2L, SC1L, SC2L) by the left light emitting unit 20L moves to the right by one spot light, while the right light emitting unit. Since the spot light train (SA1R, SA2R, SB1R, SB2R, SC1R, SC2R) by 20R moves to the left by one spot light, both ends of the monitoring area A are narrowed by one spot light respectively.

  As the spot light trains move as described above, the left spot light SA1L and the right spot light SC1R overlap as shown by the black circles, and the right spot light SC2R and the left spot light SA2L overlap. Overlap.

  Next, the first lens 22 of the left light emitting unit 20L and the first lens 22 of the right light emitting unit 20R are both returned to the initial first position, and the right light emitting element 21c is turned off in the left light emitting unit 20L. In the right light emitting section 20R, the leftmost light emitting element 21c is turned off.

  As a result, as shown in FIG. 4C, the two spot lights SA1R and SA2R on the right side and the two spot lights SC1L and SC2L on the left side in the monitoring area A are turned off, so that the state shown in FIG. When viewed, both ends of the monitoring area A are further narrowed by one spot light.

  Next, the first lens 22 of the left light emitting unit 20L is moved again from the initial first position to the right end position, and the first lens 22 of the right light emitting unit 20R is moved from the initial first position to the left end position again. Let

  Accordingly, the spot light train (SA1L, SA2L, SB1L, SB2L) by the left light emitting unit 20L in FIG. 4C moves to the right by one spot light, while the spot light train (SB1R, SB1R, Since SB2R, SC1R, and SC2R) move to the left by one spot light, as shown in FIG. 5A, both ends of the monitoring area A are further narrowed by one spot light.

  Next, both the first lens 22 of the left light emitting unit 20L and the first lens 22 of the right light emitting unit 20R are returned to the initial first position, and the light emitting element 21b at the center end is turned off in the left light emitting unit 20L. In addition, the central light emitting element 21b is also turned off in the right light emitting unit 20R.

  Accordingly, as shown in FIG. 5B, the spot light from the left light emitting unit 20L becomes two spot lights SA1L and SA2L from the left end light emitting element 21a, and the spot light from the right light emitting unit 20R is Two spot lights SC1R and SC2R are generated by the light emitting element 21c at the right end, and both ends of the monitoring area A are further narrowed by one spot light as compared with the state of FIG.

  Next, the first lens 22 of the left light emitting unit 20L is moved again from the initial first position to the right end position, and the first lens 22 of the right light emitting unit 20R is moved from the initial first position to the left end position again. Let

  Accordingly, the spot light train (SA1L, SA2L) by the left light emitting unit 20L in FIG. 5B moves to the right by one spot light, while the spot light train (SC1R, SC2R) by the right light emitting unit 20R is 1. Since it moves to the left by the spot light, as shown in FIG. 5C, both ends of the monitoring area A are further narrowed by one spot light, and finally only two spot lights are obtained.

  In the above embodiment, the first lens 22 of the left light emitting unit 20L and the right light emitting unit 20R are moved together. However, either one of the first lenses 22 is moved from the initial first position to the right end or the left end. It is also possible to repeat the movement to one of the end positions (second position), and then return the first lens 22 to the initial first position to turn off the light emitting element. A state in which only one 20L first lens 22 is moved to narrow one side of the monitoring area A is shown.

  Moreover, in the said embodiment, although the 1st lens 22 side of the light emission part 20 is moved, since the movement of the 1st lens 22 is relative to the light emitting element 21, the position of the 1st lens 22 is carried out. May be fixed and the light emitting element 21 side may be moved. The amount of movement in this case is the unit pitch W1.

  Moreover, in the said embodiment, although the 1st lens 22 side of the light emission part 20 is moved, it replaces with this and the position of the 1st lens 22 of the light emission part 20 is fixed, and the 2nd of the light-receiving part 30 is carried out. The lens 32 side may be moved in the same manner as described above.

  Moreover, in the said embodiment, although the light emission part 20 and the light-receiving part 30 side are set as the combination of 3 elements x 2 division | segmentation lenses, the light reception part 30 side can also be set as a combination of 2 elements x 3 division | segmentation lenses or 6 elements x monocular lens. Good. Further, a combination of 2 elements × 2 divided lenses may be applied to the light emitting unit 20.

  In any case, according to the present invention, the two-divided lens can be moved, and only the light emitting element needs to be electrically controlled, and the width of the monitoring area depends on the sensor installation environment while having a simple configuration. Can be adjusted in units of one spot light.

  Further, unlike the above embodiment, the position of the monitoring area A is moved in the same direction by moving the first lens 22 of the light emitting unit 20 and the second lens 32 on the light receiving unit 30 side in the same direction and the same distance. To a predetermined distance.

  In this case, the moving distance of each lens 22 and 32 may be arbitrary, and it is not necessarily required that W1> W2 in the arrangement relationship between the element and the lens.

1A Automatic door sensor 10A Case (Lens box)
20, 20L, 20R Light emitting part 21, 21a-21c Light emitting element 22 1st lens (2 split lens)
23 Lens movement guide means 30, 30L, 30R Light receiving part 31, 31a to 31c Light receiving element 32 Second lens (two-divided lens)
A Monitoring area W1 Inter-element pitch W2 Lens center distance

Claims (6)

A light emitting section having a plurality of light emitting elements that irradiate at least one row of infrared spot light through a first lens toward a monitoring area set near an entrance of an automatic door, and reflected light from the monitoring area A light receiving portion having a light receiving element that receives light through a second lens, the inter-element pitch of each of the light emitting elements is W1, and the first lens is a two-divided lens including two convex lenses, between the lens centers. In the automatic door sensor in which each of the light emitting elements and the first lens on the light emitting unit side is disposed so as to satisfy W1> W2, where the distance is W2.
The automatic door sensor, wherein the first lens side is movable by a distance W2 between the lens centers along the direction in which the light emitting elements are arranged.   2. The automatic door sensor according to claim 1, further comprising lens movement guide means for guiding the movement amount of the first lens to a distance W2 between the lens centers.   The light receiving section includes the same number of light receiving elements as the light emitting elements, and the second lens is a two-divided lens having a lens center distance W2 like the first lens. 2. The automatic door sensor according to claim 1, wherein the automatic door sensor is movable by a distance W <b> 2 between the lens centers along an element arrangement direction. 3.   2. The automatic door according to claim 1, wherein each light emitting element side is movable in units of the inter-element pitch W <b> 1 along the center-to-center distance direction of the first lens instead of the first lens. Sensor. A light emitting section having a plurality of light emitting elements that irradiate at least one row of infrared spot light through a first lens toward a monitoring area set near an entrance of an automatic door, and reflected light from the monitoring area And a light receiving section having the same number of light receiving elements that receive light through the second lens, the pitch between the light emitting elements and the light receiving elements is W1, and the first lens and the second lens are A method for adjusting the monitoring area of an automatic door sensor in which W1> W2 is established between the light emitting unit side and the light receiving unit side, where the distance between the lens centers is W2 in a two-divided lens integrally including two convex lenses In
The first lens side is movable along the direction in which the corresponding light emitting elements are arranged, and the position where the first lens is arranged at the center of each light emitting element array is an initial first position. A position in which the first lens is moved from the initial position toward any one of the arrangement directions of the light emitting elements by the lens center distance W2 is defined as a second position.
Moving the first lens from the first position to the second position to reduce the monitoring area width by one spot; and moving the first lens from the second position to the first position. The monitoring area width is reduced by one spot by repeating the second step of narrowing the monitoring area width by two spot lights by turning off one of the light emitting elements located outside the light emitting elements. A method for adjusting a monitoring area of an automatic door sensor characterized by narrowing light by light. A light emitting unit having a light emitting element that irradiates at least one line of infrared spot light through a first lens toward a monitoring area set near an entrance of an automatic door, and second reflected light from the monitoring area. In a method for adjusting a monitoring area of an automatic door sensor comprising a light receiving unit having a light receiving element that receives light through a lens,
A method for adjusting a monitoring area of an automatic door sensor, wherein the position of the monitoring area is shifted in the same direction by moving both the first lens and the second lens in the same direction and the same distance.

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