JP2020187277A - Condenser lens and monitoring camera - Google Patents

Abstract

To enable a plurality of lenses differing in focal distance to be arranged economically with high accuracy, and enable lighting to be irradiated evenly over a wide range from a near subject to a far subject.SOLUTION: A condenser lens is provided with: a frame; a plurality of narrow-angle lenses integrally formed on the frame, the respective optical axes of which are parallel; one wide-angle lens having an optical axis in the same direction as the narrow-angle lenses and integrally formed on the frame, the focal distance of which is shorter than the narrow-angle lenses, in which the distance between a light source and an interface which light from the light source enters is different from the narrow-angle lenses; and a plurality of mid-angle lenses having an optical axis in the same direction as the narrow-angle lenses and integrally formed on the frame, the focal distance of which is shorter than the narrow-angle lenses and longer than the wide-angle lens, in which the distance between the light source and the interface is different from the narrow-angle lenses and wide-angle lens.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to condenser lenses and surveillance cameras.

Some conventional security or surveillance cameras use a varifocal lens (zoom lens) that allows the field of view to be adjusted. Further, an apparatus for generating an infrared illumination beam having a variable illumination pattern capable of generating an IR illumination beam having an illumination pattern that changes with the focal length of a zoom lens is disclosed (see Patent Document 1).

Special Table 2016-516313

However, in order to evenly illuminate a near subject to a distant subject, it is desirable to provide a plurality of lenses having different focal lengths corresponding to, for example, a near subject to a distant subject. In this case, if each lens is positioned and fixed to the light source portion, the number of fixed parts increases, the lighting device becomes expensive, and the fixed structure becomes large. Further, if the positioning accuracy between each lens and each light source unit is lowered, unevenness of light and darkness occurs in the image.

The present disclosure has been devised in view of the above-mentioned conventional circumstances, and can arrange each of a plurality of lenses having different focal lengths at low cost and with high accuracy, and can evenly illuminate a subject from a near subject to a distant subject. It is an object of the present invention to provide a lens and a surveillance camera.

The present disclosure is integrally formed with the frame having a frame, a plurality of narrow-angle lenses integrally formed with the frame and having parallel optical axes, and an optical axis in the same direction as the narrow-angle lens. A wide-angle lens whose focal length is shorter than that of the narrow-angle lens and whose distance between the light source and the interface where light from this light source is incident is different from that of the narrow-angle lens, and an optical axis in the same direction as the narrow-angle lens. A plurality of lenses that are integrally formed with the frame and have a shorter focal length than the narrow-angle lens and a longer focal length than the wide-angle lens, and the distance between the light source and the interface is different from that of the narrow-angle lens and the wide-angle lens. Provided is a condenser lens including a medium-angle lens.

Further, the present disclosure has a frame, a plurality of narrow-angle lenses integrally formed with the frame and having parallel optical axes, and an optical axis in the same direction as the narrow-angle lens, and is integrally integrated with the frame. One wide-angle lens that is formed and has a shorter focal length than the narrow-angle lens, and the distance between the light source and the interface where the light from this light source is incident is different from that of the narrow-angle lens, and light in the same direction as the narrow-angle lens. It has an axis and is integrally formed with the frame, has a shorter focal length than the narrow-angle lens and a longer focal length than the wide-angle lens, and has a distance between the light source and the interface between the narrow-angle lens and the wide-angle lens. A condenser lens including a plurality of different medium-angle lenses, and a plurality of LEDs arranged corresponding to at least one of the narrow-angle lens, the wide-angle lens, and the medium-angle lens are on the same substrate. Provided is a surveillance camera having a light source unit mounted on the.

According to the condensing lens of the present disclosure, each of a plurality of lenses having different focal lengths can be arranged inexpensively and with high accuracy, and illumination can be evenly applied from a near subject to a distant subject.

According to the surveillance camera of the present disclosure, a plurality of lenses having different focal lengths can be arranged inexpensively and with high accuracy, and the illumination can be evenly illuminated from a near subject to a distant subject, and the entire surveillance camera can be miniaturized and saved. Electricity can also be realized.

Front view of an example of a surveillance camera including a condenser lens according to the first embodiment. Front view of an example of the condenser lens shown in FIG. AA sectional view of FIG. BB sectional view of FIG. CC sectional view of FIG. The figure which shows the correlation example of the angle intensity and the angle of a narrow angle illumination Diagram showing an example of the correlation between the angular intensity of wide-angle lighting and the angle The figure which shows the correlation example of the angle intensity and the angle of the medium angle lighting. The figure which shows the correlation example of the magnification and the illuminance by each lens Front view of an example of the condenser lens according to the second embodiment Perspective view of an example of the condenser lens shown in FIG. DD cross-sectional view of FIG. The figure which shows the correlation example of the angle intensity and the angle of the medium angle illumination which has a double medium angle lens.

Hereinafter, embodiments in which the configurations and operations of the condenser lens and the surveillance camera according to the present disclosure are specifically disclosed will be described in detail with reference to the drawings as appropriate. However, more detailed explanation than necessary may be omitted. For example, detailed explanations of already well-known matters and duplicate explanations for substantially the same configuration may be omitted. This is to avoid unnecessary redundancy of the following description and to facilitate the understanding of those skilled in the art. It should be noted that the accompanying drawings and the following description are provided for those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

(Embodiment 1)
FIG. 1 is a front view of an example of a surveillance camera 13 including the condenser lens 11 according to the first embodiment.

The condenser lens 11 according to the first embodiment is provided in, for example, a surveillance camera 13 which is a camera for crime prevention or surveillance. The condenser lens 11 may be provided in a camera other than a camera for crime prevention or surveillance. A fixed base 17 having a fixed pipe 15 is formed on the surveillance camera 13 above the surveillance camera 13. The surveillance camera 13 is attached in a state of hanging from, for example, a pole by fixing the fixing pipe 15 to a fixture (not shown).

The surveillance camera 13 includes a camera unit 19, a lighting device 21, a pan rotation mechanism 23, a tilt rotation mechanism 25, and a zoom mechanism (not shown).

The pan rotation mechanism 23 is rotatably attached to the fixing base 17 around the vertical axis. The pan rotation mechanism 23 rotates the imaging direction of the camera unit 19 around the vertical axis. The tilt rotation mechanism 25 is provided in the pan rotation mechanism 23. The tilt rotation mechanism 25 is swiveled by the pan rotation mechanism 23. The tilt rotation mechanism 25 holds the camera unit 19. The tilt rotation mechanism 25 rotationally drives the camera unit 19 around the center of tilt rotation orthogonal to the center of pan rotation. The pan rotation mechanism 23 and the tilt rotation mechanism 25 form a turntable portion 27. The zoom mechanism makes it possible to change the angle of view of the camera unit 19 by moving a predetermined lens of the image pickup lens unit.

In the surveillance camera 13, the pan rotation mechanism 23 and the tilt rotation mechanism 25 are not covered by the so-called dome cover. That is, the surveillance camera 13 is configured as a dome coverless PTZ (Pan Til Zoom) type.

The pan rotation mechanism 23 and the tilt rotation mechanism 25 in the PTZ type surveillance camera 13 constitute a multi-stage rotation drive mechanism in which the pan rotation mechanism 23 is the first stage on the fixed base 17 side.

The camera unit 19 captures a subject irradiated with illumination light (infrared illumination) from the light source unit 33 (see FIG. 3) via the condenser lens 11 when taking an image in a dark environment such as at night. The tilt rotation mechanism 25 holds the lighting device 21 together with the camera unit 19. The surveillance camera 13 in which the fixed base 17 is formed can take an image directly below, but in the image taken directly above, the fixed base 17 at the upper part penetrates into the image. Therefore, the turntable portion 27 has a vertically long opening 29 so that the tilt rotation in the upward direction can be secured as large as possible.

FIG. 2 is a front view of an example of the condenser lens 11 shown in FIG.

The lighting device 21 includes a base 31, a light source unit 33 (see FIG. 3), and a condenser lens 11. The base 31 is formed in a quadrangular flat plate shape in a plan view. The light source unit 33 is formed by mounting each of a plurality of light sources (hereinafter, referred to as LED 37) on one surface of the substrate 35 (see FIG. 3). The light source unit 33 is fixed to one of the bases 31 with the plurality of LEDs 37 facing each other. Each of the plurality of through holes 39 (see FIG. 3) through which each of the plurality of LEDs 37 is penetrated is bored in the base 31. Each of the plurality of LEDs 37 is provided corresponding to each of the plurality of through holes 39. That is, the LED 37 irradiates the illumination light toward each of the plurality of narrow-angle lenses 43. Further, the LED 37 irradiates the illumination light toward the wide-angle lens 45. Further, the LED 37 irradiates the illumination light toward each of the plurality of medium-angle lenses 47.

The condenser lens 11 according to the first embodiment includes a frame 41, each of a plurality of narrow-angle lenses 43, a wide-angle lens 45, and a plurality of medium-angle lenses 47, respectively. Each of the plurality of narrow-angle lenses 43, the wide-angle lens 45, and the plurality of medium-angle lenses 47 has a surface of the plurality of LEDs 37 that emits light on the side opposite to the boundary surface 49 on which the light from the corresponding LED 37 is incident. Becomes a spherical surface.

The frame 41 is fixed to the surface of the base 31 opposite to the surface to which the light source unit 33 is fixed by each of the plurality of fixing screws 51. In the frame 41, each of the plurality of narrow-angle lenses 43, one wide-angle lens 45, and each of the plurality of medium-angle lenses 47 are integrally formed.

The frame 41 is formed in a substantially quadrangular shape in a plan view. More specifically, the frame 41 has a horizontal dimension L of about 90 mm and a vertical dimension H of about 60 mm. Further, since the frame 41 forms each of the plurality of narrow-angle lenses 43, the wide-angle lens 45, and the plurality of medium-angle lenses 47 at different heights with respect to the base 31, side view. Is formed in a stepped shape (see FIG. 3). Each of the plurality of through holes 39 formed in the base 31 is arranged according to each of the plurality of narrow-angle lenses 43 of the condenser lens 11, the wide-angle lens 45, and each of the plurality of medium-angle lenses 47. Will be done.

In the condenser lens 11, four narrow-angle lenses 43 are provided. Each of the four narrow-angle lenses 43 has an optical axis 53 arranged at each corner of the quadrangle. One wide-angle lens 45 is provided. In the wide-angle lens 45, the optical axis 53 is arranged at the intersection 57 of a pair of quadrangular diagonal lines 55. Two medium-angle lenses 47 are provided. Each of the two medium-angle lenses 47 has an optical axis 53 arranged side by side in a direction parallel to any one side of the quadrangle with the wide-angle lens 45 interposed therebetween.

The condenser lens 11 is excellently made of resin from the viewpoint of mass productivity. As the resin, for example, acrylic type, epoxy type, polyester type, polycarbonate type, styrene type, vinyl chloride type and the like are preferable. In addition, the properties of the resin can be appropriately selected from a photocurable type, a thermoplastic type, and the like according to the manufacturing method. For the resin condensing lens 11, for example, a cast molding method using a mold, a press molding method, an injection molding method, or the like is practical.

When the condenser lens 11 is formed by a mold molding method, the condenser lens 11 is manufactured by, for example, injection molding a thermoplastic resin using a lens-shaped mold. In order to perform finer molding, the condenser lens 11 is filled with a photocurable resin or a thermoplastic resin in a mold and pressed, and then the resin is cured by light or heat to peel the resin from the mold. Let me. As the condenser lens 11, it is preferable to use a photocurable resin having less expansion and contraction due to heat, particularly when high accuracy is required.

The condenser lens 11 may be made of glass. The condensing lens 11 made of glass is excellent in terms of life and reliability. From an optical point of view, the condensing lens 11 is preferably made of, for example, quartz glass, molten silica, or non-alkali glass as the glass material used.

FIG. 3 is a cross-sectional view taken along the line AA of FIG.

Each of the plurality of narrow-angle lenses 43 is integrally formed with the frame 41, and the respective optical axes 53 are parallel to each other. More specifically, the outer diameter T of each of the plurality of narrow-angle lenses 43 is formed to be 30 to 31 mm. The thickness Th of each of the plurality of narrow-angle lenses 43 is formed to be 13 to 14 mm. Each of the plurality of narrow-angle lenses 43 has a plurality of LEDs 37 arranged on a substrate 35 corresponding to the position of each optical axis 53. In each of the plurality of narrow-angle lenses 43, the distance Tg between each of the plurality of LEDs 37 and each of the boundary surfaces 49 on which the light from each of the plurality of LEDs 37 is incident is set to 17 to 18 mm. The outer diameter T, thickness Th, and distance Tg of each of the plurality of narrow-angle lenses 43 are examples, and are not limited to the above-mentioned values.

FIG. 4 is a cross-sectional view taken along the line BB of FIG.

The wide-angle lens 45 has an optical axis 53 in the same direction as each of the plurality of narrow-angle lenses 43, and is integrally formed with the frame 41. The wide-angle lens 45 has a shorter focal length than each of the plurality of narrow-angle lenses 43, and each of the two LEDs 37 is arranged corresponding to the position of the optical axis 53. The wide-angle lens 45 differs from the narrow-angle lens 43 in the distance Wg between each of the two LEDs 37 and the boundary surface 49 on which the light from each of the plurality of LEDs 37 is incident. More specifically, the outer diameter W of the wide-angle lens 45 is formed to be 15 to 16 mm. The thickness Wh of the wide-angle lens 45 is formed to be 5 to 6 mm. In the wide-angle lens 45, the distance Wg between each of the two LEDs 37 and the boundary surface 49 on which the light from each of the two LEDs 37 is incident is set to 3 to 4 mm. Only the wide-angle lens 45 is arranged with each of the two LEDs 37. Each of the two LEDs 37 is arranged so as to sandwich the optical axis 53 of the wide-angle lens 45 at a pitch P. The pitch P is set to about 7 mm. The outer diameter W, thickness Wh, distance Wg, and pitch P of the wide-angle lens 45 are examples, and are not limited to the above-mentioned values.

FIG. 5 is a cross-sectional view taken along the line CC of FIG.

Each of the plurality of medium-angle lenses 47 has an optical axis 53 in the same direction as each of the plurality of narrow-angle lenses 43, and is integrally formed with the frame 41. Each of the plurality of medium-angle lenses 47 has a shorter focal length than the narrow-angle lens 43 and a longer focal length than the wide-angle lens 45. Each of the plurality of medium-angle lenses 47 has a plurality of LEDs 37 arranged on a substrate 35 corresponding to each position of the optical axis 53. Each of the plurality of medium-angle lenses 47 has a different distance between each of the plurality of LEDs 37 and each of the boundary surfaces 49 from the narrow-angle lens 43 and the wide-angle lens 45. More specifically, the outer diameter M of each of the plurality of medium-angle lenses 47 is formed to be 18 to 19 mm. The thickness Mh of each of the plurality of medium-angle lenses 47 is formed to be 10 to 11 mm. In each of the plurality of medium-angle lenses 47, the distance Mg between each of the plurality of LEDs 37 and each of the boundary surfaces 49 on which the light from each of the plurality of LEDs 37 is incident is set to 7 to 8 mm. The outer diameter M, thickness Mh, distance Mg, and pitch P of the plurality of medium-angle lenses 47 are examples, and are not limited to the above-mentioned values.

Therefore, in the condenser lens 11, the distance from each of the plurality of LEDs 37 provided for each wide-angle lens 45, each medium-angle lens 47, and each narrow-angle lens 43 to the boundary surface 49 of each lens is the wide-angle lens 45. , The medium-angle lens 47, and the narrow-angle lens 43 increase in this order.

FIG. 6 is a diagram showing an example of correlation between the angular intensity of narrow-angle illumination and the angle. The narrow-angle illumination is each of a plurality of LEDs 37 provided corresponding to each of the plurality of narrow-angle lenses 43.

6 to 8 show the results of simulating the light intensity distribution obtained through each lens in the condenser lens 11 based on the numerical values of the above-mentioned specific example. The angular intensity on the vertical axis in each figure is the light intensity per unit angle. The angle of the horizontal axis in each figure is an angle of the plurality of LEDs 37 with respect to each optical axis 53. The intensities of light emitted from each of the plurality of LEDs 37 were all the same.

Each of the plurality of narrow-angle lenses 43 can intensively and strongly irradiate a portion (angle) close to the optical axis 53 (that is, 0 °). Therefore, each of the plurality of narrow-angle lenses 43 can image a subject located at a long distance from the surveillance camera 13.

FIG. 7 is a diagram showing an example of correlation between the angular intensity of wide-angle illumination and the angle. The wide-angle illumination is each of the two LEDs 37 provided corresponding to the wide-angle lens 45.

The wide-angle lens 45 can irradiate a wide portion (angle) away from the optical axis 53 (that is, 0 °) weaker than each of the plurality of narrow-angle lenses 43. Therefore, the wide-angle lens 45 can take a wide-angle image of a subject located at a short distance from the surveillance camera 13.

FIG. 8 is a diagram showing an example of correlation between the angular intensity of medium-angle illumination and the angle. The medium-angle illumination is each of a plurality of LEDs 37 provided corresponding to each of the plurality of medium-angle lenses 47.

Each of the plurality of medium-angle lenses 47 irradiates a portion wider than each of the plurality of narrow-angle lenses 43 and narrower than the wide-angle lens 45, and can irradiate with the light intensity between the narrow-angle lens 43 and the wide-angle lens 45. Therefore, each of the plurality of narrow-angle lenses 43 can image a subject located at a medium distance from the surveillance camera 13.

FIG. 9 is a diagram showing an example of the correlation between the magnification and the illuminance of each lens.

The wide-angle lens 45 is applied to illumination having a zoom magnification of, for example, about 1 to 2. The combined use of the wide-angle lens 45 and each of the plurality of medium-angle lenses 47 is applied to illumination having a zoom magnification of, for example, about 3 to 6. Each of the plurality of medium-angle lenses 47 is applied to illumination having a zoom magnification of, for example, about 7 to 9. The combined use of each of the plurality of medium-angle lenses 47 and each of the plurality of narrow-angle lenses 43 is applied to, for example, illumination having a zoom magnification of about 10 to 15. Each of the plurality of narrow-angle lenses 43 is applied to illumination having a zoom magnification of, for example, about 17 to 40.

Next, the operation of the configuration according to the first embodiment will be described.

The condenser lens 11 according to the first embodiment includes a frame 41, a plurality of narrow-angle lenses 43 integrally formed with the frame 41 and parallel to each other, and an optical axis in the same direction as the narrow-angle lens 43. One wide-angle lens having 53, which is integrally formed with the frame 41 and has a shorter focal length than the narrow-angle lens 43, and the distance between the light source and the interface 49 on which the light from this light source is incident is different from that of the narrow-angle lens 43. The 45 and the optical axis 53 in the same direction as the narrow-angle lens 43 are integrally formed with the frame 41, and the focal length is shorter than that of the narrow-angle lens 43 and longer than that of the wide-angle lens 45. It includes a narrow-angle lens 43 and a plurality of medium-angle lenses 47 whose distances from 49 are different from those of the wide-angle lens 45.

In the condenser lens 11 according to the first embodiment, the narrow-angle lens 43, the wide-angle lens 45, and the medium-angle lens 47 are integrally formed via the frame 41. As a result, the condenser lens 11 is illuminated by the wide-angle lens 45 in the imaging range several meters away, illuminated by the narrow-angle lens 43 in the imaging range about 350 m away, and intermediate between them by the medium-angle lens 47. It is possible to realize the irradiation of illumination in the imaging range of a distance with a plurality of integrally configured lenses. As a result, the condenser lens 11 can improve the night visibility of the surveillance camera 13.

Since the condenser lens 11 can be manufactured by the mold molding method, it is excellent in mass productivity and can be manufactured at low cost.

For example, in the condenser lens 11 manufactured by the mold molding method, each of a plurality of lenses having different focal lengths can be arranged at predetermined positions with high accuracy. As a result, it is possible to suppress the positional deviation from the light source and obtain a high-quality illuminance distribution without unevenness.

Further, since each lens of the condenser lens 11 is integrally formed with the frame 41, each of the plurality of types of lenses can be collectively fixed to the light source unit 33 via the frame 41. As a result, the condenser lens 11 can reduce the members and space for individually arranging and holding each of the plurality of types of lenses, and can reduce the cost of parts.

Further, since the number of parts is reduced, the assembling work can be facilitated and the assembling work cost can be reduced.

Furthermore, since the number of fixed parts can be reduced and the lens fixing structure can be simplified, it contributes to the miniaturization of the entire lighting device.

Since the condenser lens 11 can reduce the number of parts and simplify the fixed structure, the mass can be reduced (weight reduction). The lightweight condenser lens 11 can reduce the weight of the lighting device 21. When the lighting device 21 using the condenser lens 11 is mounted on the PTZ type surveillance camera 13, it is supported by the tilt rotation mechanism 25 together with the camera unit 19. The tilt rotation mechanism 25 is further supported by the pan rotation mechanism 23. That is, the tilt rotation mechanism 25 and the pan rotation mechanism 23 constitute a multi-stage rotation drive mechanism in which the pan rotation mechanism 23 is the first stage on the fixed side. Therefore, the condenser lens 11 can reduce the mass on the drive tip side of the multi-stage rotation drive mechanism. As a result, the tilt rotation mechanism 25 can be miniaturized, and finally the pan rotation mechanism 23 can also be miniaturized. As a result, it is possible to realize miniaturization and power saving of the entire surveillance camera 13.

Further, in the condenser lens 11, the distances from each of the plurality of LEDs 37 provided in the light source unit 33 to each of the boundary surfaces 49 of each lens are in the order of the wide-angle lens 45, the medium-angle lens 47, and the narrow-angle lens 43. growing.

In the condenser lens 11, the focal length can be increased in the order of the wide-angle lens 45, the medium-angle lens 47, and the narrow-angle lens 43. The longer the focal length of the lens, the more the light from the light source can be stopped (the portion close to the optical axis 53 is intensively irradiated). In other words, each of the plurality of LEDs 37 provided in the light source unit 33 corresponding to each lens can be arranged in the same plane by changing the position of the boundary surface 49 of the corresponding lens. Therefore, the condenser lens 11 has a plurality of light source units 33 on the same plane of one substrate 35 by changing the distance of the boundary surface 49 of each lens from each of the plurality of LEDs 37 provided in the light source unit 33. Each of the plurality of LEDs 37 provided in each can be mounted collectively. As a result, the condenser lens 11 can simply configure the light source unit 33.

Further, in the condenser lens 11, each of the four narrow-angle lenses 43 has an optical axis 53 arranged at each corner of the square, and in the wide-angle lens 45, the optical axis 53 is arranged at the intersection 57 of a pair of diagonal lines 55 of the square. Each of the two medium-angle lenses 47 has an optical axis 53 arranged side by side in a direction parallel to any one side of the quadrangle with the wide-angle lens 45 interposed therebetween.

In the condenser lens 11, each of the four narrow-angle lenses 43 that can obtain strong light by reducing the irradiation angle is used for irradiating the illumination in the imaging range about 350 m away. Each of the four narrow-angle lenses 43 intensively illuminates a distant imaging range. Therefore, in each of the four narrow-angle lenses 43, each optical axis 53 is radially arranged around the center of the imaging range. This radial arrangement is realized by arranging the optical axis 53 of each lens at each corner of the quadrangle. The condenser lens 11 can form the outer shape of the frame 41 into a simple quadrangle by arranging each of the four narrow-angle lenses 43 on the outermost circumference. Since each of the four narrow-angle lenses 43 has a small irradiation angle, there is an advantage that eclipse due to peripheral members is less likely to occur even when the condensing lens 11 is arranged on the outermost circumference.

On the other hand, one wide-angle lens 45 is used for irradiating the illumination in a nearby imaging range by increasing the irradiation angle and using relatively weak light. Therefore, the wide-angle lens 45 is arranged at the intersection 57 of a pair of diagonal lines 55 whose optical axes 53 are quadrangular. That is, the wide-angle lens 45 is arranged at the center of the quadrangular frame 41. By arranging the wide-angle lens 45 having a large irradiation angle in the center of the condensing lens 11, it is possible to arrange the wide-angle lens 45 at a position where eclipse due to peripheral members is least likely to occur among the plurality of lenses.

Each of the four narrow-angle lenses 43 and one wide-angle lens 45 are arranged in the extra space of the quadrangular frame 41 arranged at each corner and in the center, and each of the two medium-angle lenses 47 is arranged. That is, in each of the two medium-angle lenses 47, the optical axes 53 are arranged side by side in a direction parallel to any one side of the quadrangle with the wide-angle lens 45 narrowed. Therefore, the quadrangular frame 41 has a rectangular shape in which one side of the two medium-angle lenses 47 is arranged along the short side.

Further, in the condenser lens 11, by arranging the narrow-angle lens 43, the wide-angle lens 45, and the medium-angle lens 47 in the right place in such a suitable material, unevenness (such as eclipse) occurs while realizing a high-density lens arrangement. It is possible to irradiate difficult lighting.

The surveillance camera 13 according to the first embodiment includes a frame 41, each of a plurality of narrow-angle lenses 43 integrally formed with the frame 41 and having parallel optical axes 53, and each of the plurality of narrow-angle lenses 43. It has an optical axis 53 in the same direction and is integrally formed with the frame 41, has a shorter focal length than each of the plurality of narrow-angle lenses 43, and has a plurality of distances between the light source and the interface 49 on which the light from the light source is incident. Each of the plurality of narrow-angle lenses 43 having one wide-angle lens 45 different from each of the narrow-angle lenses 43 and an optical axis 53 in the same direction as each of the plurality of narrow-angle lenses 43 and integrally formed on the frame 41. The focal length is shorter than that of the wide-angle lens 45, the focal length is longer than that of the wide-angle lens 45, and the distance between the light source and the boundary surface 49 is 43 for each of the plurality of narrow-angle lenses and a plurality of medium-angle lenses 47 that are different from the wide-angle lens 45. A plurality of LEDs 37, which are arranged corresponding to at least one of the condenser lens 11, the narrow-angle lens 43, the wide-angle lens 45, and the medium-angle lens 47, are mounted on the same substrate 35 with the light source unit 33. Have.

In the surveillance camera 13 according to the first embodiment, the narrow-angle lens 43, the wide-angle lens 45, and the medium-angle lens 47 are formed by an integrated condensing lens 11, and a plurality of LEDs 37 corresponding to each lens are one of the light source 33. It is mounted on one board 35. The condensing lens 11 and the light source unit 33 constitute an illumination device 21. In this lighting device 21, each LED 37 is collectively positioned for each lens as compared with a structure in which each of the plurality of LEDs 37 formed as a single unit is individually positioned for each of a plurality of lenses having different focal lengths formed as a single unit. Can be positioned with high accuracy. As a result, it is possible to suppress the positional deviation from the light source and obtain a high-quality illuminance distribution without unevenness. In addition, the number of parts can be reduced and the assembly work can be facilitated, so that the product cost can be reduced. Further, the lighting device 21 including a plurality of lenses and a plurality of light sources can be miniaturized. Further, the weight of the lighting device 21 can be reduced.

(Embodiment 2)
Next, the condenser lens 59 according to the second embodiment will be described.

FIG. 10 is a front view of an example of the condenser lens 59 according to the second embodiment.

In the second embodiment, the same components as those shown in the first embodiment are designated by the same reference numerals, and redundant description will be omitted.

In the condenser lens 59 according to the second embodiment, one of the two medium-angle lenses 47 has the same shape as the other medium-angle lens 47, and the optical axis 53 of the lens is shifted in a direction perpendicular to one side. It is formed by stacking two pieces. This shift dimension d is set to about 2.4 mm.

FIG. 11 is a perspective view of an example of the condenser lens 59 shown in FIG.

The medium-angle lens in which these two lenses are staggered and overlapped is referred to as a double medium-angle lens 61. The double medium-angle lens 61 has two spherical tops. In the double medium-angle lens 61, the valley groove portion 63 in the direction along one side is formed between the two tops.

FIG. 12 is a cross-sectional view taken along the line DD of FIG.

The valley groove portion 63 has a curved surface R having a minute cross section orthogonal to the groove extending direction. More specifically, the curved surface R is 0.2 mm. The major axis M2 of the double medium angle lens 61 is formed with a length of 19 to 20 mm. The thickness Mh of the double medium-angle lens 61 is 10 to 11 mm. In the double medium-angle lens 61, the distance Mg between the LED 37 and the boundary surface 49 on which the light from the LED 37 is incident is set to 7 to 8 mm. Other configurations are the same as in the first embodiment. The curved surface R, major axis M2, thickness Mh, and distance Mg of the valley groove portion 63 of the double medium-angle lens 61 are not limited to the above-mentioned values, and are shown in FIG. 8 as in the medium-angle illumination shown in FIG. Any value may be used as long as it is possible to obtain a light intensity distribution capable of irradiating a wider part (angle) than the light intensity distribution of medium-angle illumination.

FIG. 13 is a diagram showing an example of the correlation between the angular intensity and the angle of the medium-angle illumination having the double medium-angle lens 61.

The double medium-angle lens 61 can irradiate a portion wider than each of the plurality of narrow-angle lenses 43 and narrower than the wide-angle lens 45 with the light intensity between each of the plurality of narrow-angle lenses 43 and the wide-angle lens 45. Further, the double medium-angle lens 61 can irradiate a wider portion than the medium-angle lens 47 shown in FIG. 8 by the amount that the two optical axes 53 are separated from each other.

Next, the operation of the configuration according to the second embodiment will be described.

The condenser lens 59 has a shape in which one of the two medium-angle lenses 47 has the optical axis 53 of a lens having the same shape as the other medium-angle lens 47 shifted in a direction perpendicular to one side and two are overlapped. Is formed by.

In the condenser lens 59, one of the two medium-angle lenses 47, the medium-angle lens 47, is composed of two lenses having the same shape as the other medium-angle lens 47. The two lenses are formed by shifting the optical axis 53 in a direction perpendicular to one side and overlapping the two shifted lenses. The double medium-angle lens 61 adjusts the illuminance distribution to a horizontally long rectangular angle of view by superimposing the focused illumination at different angles by arranging the two lenses at a distance from each other. Can be expanded.

When both of the two medium-angle lenses 47 are double medium-angle lenses 61, strong light with concentrated illumination is irradiated at two places near the optical axis 53 of each of the two lenses, and the illuminance between them is increased. It becomes smaller and the image becomes uneven. Therefore, in the condenser lens 59, only one of the two medium-angle lenses 47 is a double medium-angle lens 61. As a result, the condenser lens 59 suppresses the weakening of the illuminance between the two places irradiated with strong light, and prevents uneven brightness in the image.

Further, the double medium-angle lens 61 can widen the light distribution of the illumination transmitted through the double medium-angle lens 61 in the separation direction by the amount that the respective optical axes 53 are separated from each other.

The surveillance camera 13 according to the second embodiment is a camera unit 19 that captures a subject irradiated with illumination light from a light source unit 33 via a condenser lens 59, and a pan rotation mechanism that rotates the imaging direction of the camera unit 19. 23, a tilt rotation mechanism 25 that rotates the camera unit 19 held by the pan rotation mechanism 23 around a tilt rotation center orthogonal to the center of rotation, and a zoom mechanism that changes the angle of view of the camera unit 19.

Since the surveillance camera 13 according to the second embodiment has the same configuration as the surveillance camera 13 except for the condenser lens 59, the illustration is omitted.

In the surveillance camera 13, the camera unit 19 is supported by the pan rotation mechanism 23 so as to be rotationally driveable around the vertical axis, and is supported by the tilt rotation mechanism 25 so as to be rotationally driveable around the horizontal axis. In addition, the zoom mechanism makes it possible to change the focal length. That is, the surveillance camera 13 is a PTZ type.

In the condenser lens 59 provided in the surveillance camera 13, only one of the two medium-angle lenses 47 is a double medium-angle lens 61.

The double medium-angle lens 61 is irradiated with strong light with concentrated illumination at two locations near the optical axis 53 of each of the two lenses. That is, the double medium-angle lens 61 can widen the light distribution of the illumination in the distance direction by the amount that the respective optical axes 53 are separated from each other.

In the surveillance camera 13 in which the condenser lens 59 is used, the double medium-angle lens 61 is arranged on the upper side in the vertical direction. In the case of the PTZ type in which the upper part of the surveillance camera 13 is fixed, it is possible to take an image directly below, but in the case of an image directly above, the fixed base 17 on the upper part penetrates into the image. Therefore, the turntable portion 27 has a vertically long opening 29 that can secure the tilt rotation in the upward direction as much as possible. In this case, in the configuration provided on the upper side of the camera unit 19, the condenser lens 59 interferes with the upper end of the opening 29 before the camera unit 19 when tilting upward. That is, a part of the upper illumination may be eclipsed and the illuminance may be reduced due to the upper end of the opening 29.

Therefore, in the condenser lens 59, the upper middle angle lens 47 is a double middle angle lens 61. The double medium-angle lens 61 obtains a bright image in the lateral direction by expanding the light distribution of the illumination in the direction in which the two lenses are separated from each other. As a result, the condenser lens 59 suppresses the image from becoming unnaturally dark (unevenness occurs in the image) even if the illumination is eclipsed at the upper end of the opening 29 at the elevation angle of the surveillance camera 13.

Therefore, according to the condenser lens 11 and the condenser lens 59 according to the second embodiment, a plurality of lenses having different focal lengths can be arranged inexpensively and with high accuracy, and the illumination is evenly distributed from a near subject to a distant subject. Can be irradiated.

According to the surveillance camera 13 according to the second embodiment, a plurality of lenses having different focal lengths can be arranged inexpensively and with high accuracy, and the illumination can be evenly illuminated from a near subject to a distant subject, and the entire surveillance camera 13 can be illuminated. It is also possible to realize miniaturization and power saving.

Although various embodiments have been described above with reference to the accompanying drawings, the present disclosure is not limited to such examples. It is clear that a person skilled in the art can come up with various modifications, modifications, substitutions, additions, deletions, and equality examples within the scope of the claims. It is understood that it belongs to the technical scope of the present disclosure. In addition, each component in the various embodiments described above may be arbitrarily combined as long as the gist of the invention is not deviated.

In the present disclosure of a condenser lens and a surveillance camera, a plurality of lenses having different focal lengths can be arranged inexpensively and with high accuracy, and the condenser lens and surveillance capable of evenly illuminating a subject from a near subject to a distant subject. It is useful as a camera.

11 Condensing lens 13 Surveillance camera 19 Camera unit 23 Pan rotation mechanism 25 Tilt rotation mechanism 33 Light source unit 35 Board 37 LED
41 Frame 43 Narrow-angle lens 45 Wide-angle lens 47 Medium-angle lens 49 Boundary surface 53 Optical axis 55 Diagonal line 57 Intersection

The present invention includes a frame formed in a substantially quadrangular shape in plan view, are formed integrally with the frame, parallel to the optical axes and Do Ri, four narrow-angle arranged on each of the four corners of the frame One lens and an optical axis having an optical axis in the same direction as the narrow-angle lens, integrally formed with the frame, having a shorter focal length than the narrow-angle lens, and arranged at the intersection of two diagonal lines at the four corners . and wide-angle lens, the integrally formed with the frame has an optical axis of the narrow-angle lens in the same direction, longer focal length than and the wide-angle lens a short focal length than the narrow-angle lens, the generally rectangular It comprises two narrow-angle lenses arranged along one side of each of the shapes facing each other and two medium- angle lenses arranged surrounded by the wide-angle lens, and is in one of the two medium-angle lenses. The angular lens has two apexes in a second direction orthogonal to the first direction connecting the optical axis of the other medium-angle lens and the optical axis of the wide-angle lens, and between the two apexes and in the first direction. that having a and formed valley groove so as to extend with a predetermined curvature along, to provide a condenser lens.

Further, the present invention includes a condenser lens according to any one of claims 1 to 3, wherein the four narrow-angle one LED corresponding to each of the lens, corresponding to said one wide-angle lens two LED, 1 single LE D to correspond to each of the two medium-angle lens has a light source portion mounted on the same base, to provide a surveillance camera.

The present invention includes a frame formed in a substantially rectangular shape in plan view, are formed integrally with the frame, the optical axes are parallel, and the four narrow-angle lenses arranged in each of the four corners of the frame , A wide-angle lens that has an optical axis in the same direction as the narrow-angle lens, is integrally formed with the frame, has a shorter focal length than the narrow-angle lens, and is arranged at the intersection of two diagonal lines at the four corners. If the is the narrow-angle lens in the same direction has an optical axis formed integrally with the frame, a longer focal length than and the wide-angle lens a short focal length than the narrow-angle lens, the substantially rectangular shape comprising of the two longitudinal two medium-angle lenses arranged surrounded by two of said narrow angle lens and the wide-angle lens arranged along the, respectively that of the sides, a, of the two medium-angle lens One medium-angle lens is formed so as to extend with a predetermined curvature between the two apexes in the longitudinal direction and along a direction orthogonal to the longitudinal direction between the two apexes in a plan view. Provided is a condenser lens having a valley groove portion formed therein.

Claims (6)

With the frame
A plurality of narrow-angle lenses integrally formed with the frame and having parallel optical axes.
It has an optical axis in the same direction as the narrow-angle lens and is integrally formed with the frame. The focal length is shorter than that of the narrow-angle lens, and the distance between the light source and the interface where the light from the light source is incident is the above. One wide-angle lens that is different from the narrow-angle lens,
It has an optical axis in the same direction as the narrow-angle lens and is integrally formed with the frame. The focal length is shorter than that of the narrow-angle lens and longer than that of the wide-angle lens, and the light source and the interface are A plurality of medium-angle lenses having a distance different from that of the narrow-angle lens and the wide-angle lens.
Condenser lens. The distance of each of the boundary surfaces from the light source increases in the order of the wide-angle lens, the medium-angle lens, and the narrow-angle lens.
The condenser lens according to claim 1. Each of the four narrow-angle lenses has an optical axis arranged at each corner of the quadrangle.
In the wide-angle lens, the optical axis is arranged at the intersection of the pair of diagonal lines of the quadrangle.
Each of the two medium-angle lenses has an optical axis arranged side by side in a direction parallel to any one side of the quadrangle with the wide-angle lens in between.
The condenser lens according to claim 1 or 2. One of the two medium-angle lenses is formed in a shape in which two lenses having the same shape as the other medium-angle lens are overlapped by shifting the optical axis in the direction perpendicular to one side.
The condenser lens according to claim 3. With the frame
A plurality of narrow-angle lenses integrally formed on the frame and having parallel optical axes,
It has an optical axis in the same direction as the narrow-angle lens and is integrally formed with the frame. The focal length is shorter than that of the narrow-angle lens, and the distance between the light source and the interface where the light from the light source is incident is narrow. One wide-angle lens that is different from the angle lens,
It has an optical axis in the same direction as the narrow-angle lens and is integrally formed with the frame. The focal length is shorter than that of the narrow-angle lens and longer than that of the wide-angle lens, and the distance between the light source and the boundary surface is long. A condenser lens including the narrow-angle lens and a plurality of medium-angle lenses different from the wide-angle lens.
Each of the plurality of LEDs arranged corresponding to at least one of the narrow-angle lens, the wide-angle lens, and the medium-angle lens has a light source unit mounted on the same substrate.
Surveillance camera. A camera unit that captures a subject irradiated with illumination light from the light source unit via the condenser lens, and a camera unit.
A pan rotation mechanism that rotates the imaging direction of the camera unit,
A tilt rotation mechanism that rotates the camera unit held by the pan rotation mechanism around a tilt rotation center orthogonal to the center of rotation, and a tilt rotation mechanism.
It has a zoom mechanism that changes the angle of view of the camera unit.
The surveillance camera according to claim 5.

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