JP4659155B2 - Visual inspection light - Google Patents

Description

  The present invention relates to a visual inspection light, and more particularly to a visual inspection light capable of irradiating light with an arbitrary color onto an inspection object without using a color filter.

  Conventionally, a magnifying glass for visual inspection in which a circular fluorescent lamp is arranged concentrically with a convex lens has been proposed (for example, Patent Document 1). This visual inspection magnifier is provided with a color filter between a fluorescent lamp and a subject.

Registered Utility Model No. 3011551

  The problem to be solved by the present invention is that the above-described visual inspection magnifier requires a color filter in order to change the color of the light irradiated to the subject, and it is necessary to prepare color filters of various colors. In addition, there is a problem that the mechanism for mounting the color filter is necessary, and the operation management is complicated because the color filter must be managed.

  The present invention solves the above-mentioned problems and does not require a color filter or a mechanism for mounting the color filter, and is optimal for visual inspection capable of irradiating light with a color necessary for visual inspection of an inspection object. It is an object to provide an inspection light.

In order to solve the above-mentioned problems, the visual inspection light according to the present invention has the following requirements.
(B) The visual inspection light includes an annular light guide, a number of LEDs that irradiate light from both side surfaces in the longitudinal direction of the light guide toward the inside of the light guide, and the light guide. An annular cover body , and the light of the LED is mixed inside the light guide body and irradiated from the lower surface of the light guide body. (C) The light guide diffused inside the light guide is guided to the upper surface of the light guide formed by a curved surface. Provided a reflective film that reflects toward the lower surface of the light body
(2) The cover body has a substantially U-shaped cross section with an open lower end, and covers the light guide body so that a gap is formed between the cover body and the lower surface of the light guide body. Exposing from the opening surface of the body
(E) The flexible substrate includes an inner flexible substrate that is fixed over the entire inner periphery of the cover body, and an outer flexible substrate that is fixed over the entire outer periphery of the cover body. A flexible substrate, and the LEDs provided on each flexible substrate face the inside of the cover body so that these LEDs face the side surface of the light guide.

Moreover, you may attach a circular magnifier to the opening part of the center of the said cover body .

According to the present invention, since it is possible to irradiate the inspection object with light of any color without using a color filter, it is necessary to prepare color filters of various colors, the trouble of replacing the color filter, and the color filter. Therefore, it is possible to realize a light for visual inspection with excellent handling that can irradiate the inspection object with an arbitrary color with a simple structure and is not bothered by management of the filter.

Further, by housing the LED in the cover body, it is possible to dissipate heat generated by the LED, and it is possible to provide a light for visual inspection having a simple structure without requiring a separate cooling device.

In addition, since there is no socket part like a circular fluorescent lamp, the ring of light is not divided, and the light for visual inspection can irradiate the test object evenly without generating a dark end part. Can be provided.

(A) (b) is a front view and a plan view of a loupe light to which the visual inspection light of the present invention is applied. (A) and (b) are the bottom view perspective view of the light for visual inspection, and the bottom view perspective view of the state cut from the center. Bottom side exploded perspective view of the visual inspection light Vertical end view of the visual inspection light Bottom perspective view explaining assembly of the visual inspection light The block diagram explaining the structure of the control part which controls the said light for visual inspection

  FIG. 1 (a) shows an example of application of a visual inspection light A according to the present invention. This visual inspection light A is applied to a loupe light B, and this loupe light B irradiates the inspection object with light. In addition, the inspection object can be enlarged and viewed with a magnifying glass, and is used for visual inspection on a cover 3 attached to the tip of an arm 2 provided on a base 1 that is fixed to a work table (not shown) by appropriate means. Visual inspection in which a light A is arranged and a circular magnifying glass 5 is attached to the central opening 4 of the disc-shaped cover 3 and formed in an annular shape outside the magnifying glass 5 as shown in FIG. The light A is used.

  As shown in FIGS. 2 (a), 2 (b) and 3, the visual inspection light A includes a metal cover body 10 which is annular and has a substantially U-shaped cross section so that the lower surface opens. The light guide 11 is formed of a light-transmitting material (for example, acrylic resin) in an annular shape so that it can be accommodated in the cover body 10, and the flexible substrate 13 on which the surface-mounted LED 12 is mounted.

  As shown in FIG. 4, the light guide 11 is housed in the cover body 10 so that the cross section is formed in an approximately elliptical shape, and the lower surface 11 a is exposed downward from the opening 10 a of the cover body 10. The flexible substrate 13 on which the LEDs 12 are mounted is fixed to the inner inner peripheral surface 10b and the outer inner peripheral surface 10c of the cover body 10, respectively.

  Then, a white paint is applied to the upper surface 11b facing the lower surface 11a of the light guide 11 to form a reflective film 14, and the light of the LED 12 is reflected by the reflective film 14 and mixed to form a lower surface (hereinafter referred to as light emission). The light is emitted from 11a.

  As shown in FIG. 3, the LED 12 is composed of three types of LEDs, a red LED 12a, a green LED 12b, and a blue LED 12c, mounted on the flexible substrate 13 at equal intervals. As shown in FIG. The flexible substrate 13 is curved and fixed by an appropriate means such as an adhesive so that the LED 12 faces the inner side of the cover body 10 on the inner peripheral surface 10b and the outer inner peripheral surface 10c, and the side surface of the light guide 11 is attached to the LED 12 If it is accommodated in the cover body 10 so as to oppose and a screw (not shown) is screwed into the light guide body 11 from the outside of the cover body 10 and fixed to the cover body 10, as shown in FIG. Light A can be constructed.

  In addition, by forming the cover body 10 with a metal having thermal conductivity and light reflectivity such as aluminum, a heat radiation function for radiating heat generated by the LED 12 can be exhibited, and at the inner wall surface of the cover body 10 Light emitted from the light guide 11 can also be emitted from the opening 11a.

  The LED 12 may be a three-color LED in which a red LED, a green LED, and a blue LED are integrated in one package.

  The light emission of the LED 12 is controlled by the control unit 15. As shown in FIG. 6, the control unit 15 includes a dimming unit 16 and an LED driver 17, and a dimming signal (for example, a PWM signal) is generated by the dimming unit 16 by operating the potentiometer 18. Then, the LED driver 17 may be configured by a known control unit that can control light emission of the LED 12 based on the dimming signal and perform dimming. The control unit 15 includes a red control unit 15a, a green control unit 15b, and a blue control unit 15c corresponding to the red LED 12a, the green LED 12b, and the blue LED 12c, respectively. The red control unit 15a includes the dimming unit 16a, the LED driver 17a, The green control unit 15b includes a light control unit 16b and an LED driver 17b, and the blue control unit 15c includes a light control unit 16c and an LED driver 17c.

  The LED driver 17a that drives the red LED 12a is connected to a red LED group 12aG configured by connecting a number of red LEDs 12a in series, and the LED driver unit 17b that drives the green LED 12b is connected to a number of green LEDs 12b in series. The LED driver unit that drives the blue LED 12c is connected to the blue LED group 12cG that is configured by connecting a number of blue LEDs 12c in series, and the potentiometer 18a, By operating 18b and 18c, a dimming signal is created by the dimming units 16a, 16b, and 16c, and the LED drivers 17a, 17b, and 17c emit (blink) the LEDs 12a, 12b, and 12c based on the dimming signal. Red LED 12a, green LED 12b and blue Emission ED12c is enabled to be exiting from the light mixing to the desired light exit surface 11a of the light guide 11 becomes color in the light guide 11.

  According to the visual inspection light A having the above configuration, the potentiometers 18a, 18b, and 18c are operated to control the dimming signals that drive the LEDs 12a, 12b, and 12c of the respective colors, and the LEDs 12a of the three groups of LEDs 12aG, 12bG, and 12cG. , 12b, 12c may be adjusted so that the result is the same color as the color to be inspected. Since the light from the LED 12 is mixed in the light guide 11 and emitted from the light exit surface 11a, it is possible to irradiate the inspection target with a uniform and spotless color unlike the case of direct irradiation with the light from the LED 12.

  In this state, an object to be inspected (for example, a printed material in which a base is printed in blue or white and characters or designs are printed in red on the base) is placed on the work table, and whether or not there is a scratch on the printing. When inspecting the light, the potentiometers 18a, 18b, and 18c are adjusted, and the LEDs 12a, 12b, and 12c are dimmed so that the light emitted from the light guide 11 has the same color as the printing color. If the color emitted from the body 11 is adjusted and the printed material is viewed through the magnifying glass 6, the color of the inspection object is emphasized and the object to be visually inspected can be extracted and viewed, so that it can be changed to other colors. Visual inspection can be easily performed without being overlooked.

  As described above, according to the visual inspection light of the present invention, since it is possible to irradiate the test object with light of any color without using a color filter, it is necessary to prepare color filters of various colors. Since there is no need for management and no mechanism for mounting a color filter is required, it is possible to realize a light for visual inspection that is simple and excellent in operation management.

  Since the flexible substrate 13 is fixed to the inner wall surface of the metal cover body 10, the heat generated by the LEDs 12 is dissipated through the cover body 10, so that even the LED 12 housed in a closed space is affected by the heat generation. It is possible to drive normally without receiving.

  In addition, although the above-described visual inspection light A has the light guide 11 formed in an annular shape and the circular magnifier 5 is disposed on the inner side, the shape of the light guide 11 is not limited to an annular shape. The magnifying glass 5 may be formed in a rectangular shape so that it can be placed inside the visual inspection light A, or the light guide 11 is formed in a rod shape to form the visual inspection light A in a straight tube shape. The visual inspection light A may be arranged in parallel as a surface light source and irradiated onto the inspection object. The shape can be freely set according to the mode of use, and the degree of freedom in design can be set. A high visual inspection light can be realized.

10 Cover body 11 Light guide body 12 LED
12a Red LED
12b Green LED
12c Blue LED
13 Flexible substrate 14 Reflective film 15 Control part A Visual inspection light

Claims (2)

Light for visual inspection characterized by having the following requirements.
(B) The visual inspection light includes an annular light guide, a number of LEDs that irradiate light from both side surfaces in the longitudinal direction of the light guide toward the inside of the light guide, and the light guide. An annular cover body , and the light of the LED is mixed inside the light guide body and irradiated from the lower surface of the light guide body. (C) The light guide diffused inside the light guide is guided to the upper surface of the light guide formed by a curved surface. Provided a reflective film that reflects toward the lower surface of the light body
(2) The cover body has a substantially U-shaped cross section with an open lower end, and covers the light guide body so that a gap is formed between the cover body and the lower surface of the light guide body. Exposing from the opening surface of the body
(E) The flexible substrate includes an inner flexible substrate fixed along the inner inner peripheral surface of the cover body, and an outer flexible substrate fixed along the outer inner peripheral surface of the cover body. The LEDs provided on the respective flexible boards are arranged so as to face the side surfaces of the light guide when the LEDs face the inside of the cover body.   The light for visual inspection according to claim 1, wherein a circular magnifying glass is attached to the central opening of the cover body.

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