JP2013026846A - Skin observation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a skin observation device that enables proximity illumination, facilitates change of an irradiation angle for each LED, and facilitates miniaturization.SOLUTION: In a skin observation device, because light emitted from an LED 5 is reflected at a mirror 12 and then radiated onto a skin S, unevenness is less likely generated to illumination, and such a proximity illumination that illumination is approached to the skin S becomes possible. Further, a polarization filter 2 comprises a first polarization filter part 2A making a cross shape by four projection pieces 2a, and a second polarization filter part 2B arranged at a circumference of the first polarization filter part 2A and having an optical phase difference of 90 degrees to the first polarization filter part 2A. Therefore, first mirror parts 12A can be arranged at positions corresponding to the respective projection pieces 2a of the first polarization filter part 2A, and second mirror parts 12B can be arranged at positions corresponding to the second polarization filter part 2B between the adjacent projection pieces 2a, and second light source parts can be juxtaposed at both sides of first light source parts.

Description

  The present invention relates to a skin observation apparatus used for enlarging and imaging a skin surface.

  Conventionally, there is JP, 2004-187248, A as technology in such a field. In the skin observation apparatus described in this publication, light emitted from the light emitting element array on the side close to the optical axis passes through the first polarizing plate and is irradiated to the subject as polarized light having a horizontal vibration direction. Although the light reflected from the surface is polarized, it passes through the first polarizing plate in the same vibration direction, and then forms an image on the imaging device through the lens. On the other hand, light emitted from the light emitting element array on the side away from the optical axis passes through the second polarizing plate and is irradiated to the subject as polarized light having a vertical vibration direction. Since the light reflected from the surface maintains the polarization in the vertical vibration direction, it is blocked by the first polarizing plate in the horizontal direction and does not reach the image sensor. The light reflected after entering the skin passes through the first polarizing plate and reaches the image sensor. Therefore, when the light emitting element array on the side close to the optical axis emits light, a texture mode that is an illumination mode utilizing surface reflected light, and when the light emitting element array on the side far from the optical axis is lit, a stain mode that removes surface reflected light. It becomes.

JP 2004-187248 A

  However, in the above-described conventional skin observation apparatus, the light from the light emitting element is directly irradiated to the subject through the polarizing plate. Therefore, the closer the illumination is to the subject, the more easily the unevenness in the illumination occurs. There is a problem that proximity lighting is difficult. In addition, when observing the skin, it is necessary to change the illumination angle when observing skin texture and spots. In the past, when changing the direction of light emission from the light emitting element, the light emitting element array is placed outside. , Which makes it difficult to reduce the size of the device.

  An object of this invention is to provide the skin observation apparatus which enabled proximity illumination, changed the irradiation angle easily for every LED, and made size reduction easy.

The present invention relates to a skin observation apparatus for observing the skin condition by illumination.
Multiple LEDs that illuminate the skin,
A polarizing filter disposed on the optical axis between the LED and the skin to transmit the light from the LED;
An image sensor that receives reflected light from the skin illuminated by the LED and images the skin;
An imaging optical unit for condensing reflected light from the skin onto the image sensor;
A mirror that is arranged on the optical axis between the LED and the polarizing filter, and makes light incident on the skin by reflection;
A polarizing filter, a mirror, and a base to which the LED is fixed,
The polarizing filter is arranged around the first polarizing filter unit and the first polarizing filter unit having a cross shape with four convex pieces, and an optical phase difference of 90 degrees with respect to the first polarizing filter unit. A second polarizing filter section having
The mirror has a first mirror part disposed at a position corresponding to each convex piece of the first polarizing filter part and a second part disposed at a position corresponding to the second polarizing filter part between adjacent convex pieces. And a mirror part of
The LED includes a first light source unit that emits light toward the first mirror unit, and second light source units juxtaposed on both sides of the opposing first light source unit.

  In this skin observation apparatus, the light emitted from the LED is reflected by the mirror and then applied to the skin, so that uneven illumination is unlikely to occur, and close-up illumination that allows the illumination to approach the skin is possible. Furthermore, it is necessary to change the illumination angle when observing skin texture and stains. However, in the present invention, different illuminations are used when observing skin texture and stains only by changing the light reflection angle of the mirror. Angles can be produced easily. In this case, it is not necessary to multiplex the LED array when changing the illumination angle, which contributes to downsizing of the apparatus. Furthermore, the polarizing filter is arranged around the first polarizing filter unit, the first polarizing filter unit having a cross shape formed by four convex pieces, and 90 ° light with respect to the first polarizing filter unit. A second polarizing filter section having a phase difference, and the mirror is disposed between the first mirror section disposed at a position corresponding to each convex piece of the first polarizing filter section and the adjacent convex pieces. The second light source unit can be juxtaposed on both sides of the first light source unit by including the second mirror unit disposed at a position corresponding to the second polarizing filter unit. Accordingly, it is possible to arrange the first light source unit and the second light source unit next to each other and the first mirror unit and the second mirror unit next to each other, and fix the mirror and the LED. Therefore, the base part can be made compact.

Further, the base portion has a substantially rectangular parallelepiped shape including a flat surface and a bottom surface facing each other and four side surfaces between the flat surface and the bottom surface, and a polarizing filter is fixed to the bottom surface of the base portion. It is preferable that a concave portion for accommodating the LED and the mirror is formed, and the concave portion is opened at the side surface.
Thus, by forming the recess on the bottom surface of the base portion, the LED and the mirror do not protrude from the bottom surface of the base portion, and the LED and the mirror can be reliably stored in the base portion. Furthermore, since the recess is opened on the side surface of the base portion, it is possible to assemble the LED by inserting it from the side surface of the base portion, and the workability of assembling the LED to the base portion is improved.

  According to the present invention, it is possible to perform close-up illumination, easily change the irradiation angle for each LED, and facilitate downsizing.

It is an external appearance perspective view which shows the state by which the nozzle for observation was fixed to the imaging illumination unit applied to the skin observation apparatus which concerns on this invention. It is a disassembled perspective view which shows an imaging illumination unit. It is sectional drawing of FIG. It is a bottom view of an imaging illumination unit.

  Hereinafter, preferred embodiments of a skin observation apparatus according to the present invention will be described in detail with reference to the drawings.

  The skin observation apparatus includes a handy type or a stationary type, and any type is provided with an imaging illumination unit U as shown in FIGS. The imaging illumination unit U includes an imaging device such as a CCD or a CMOS image sensor and illumination, and the state of the imaged skin S is displayed on a monitor (not shown) as an image.

  As shown in FIGS. 1 and 2, the imaging illumination unit U includes a unit main body 1 and a polarization filter 2 that is fixed to the unit main body 1 and enables illumination to be polarized. The observation nozzle 10 is fixed to the imaging illumination unit U, and the observation nozzle 10 presses the distal end against the skin S and the body 10a having a rectangular tube shape in order to fix the imaging illumination unit U inside. Therefore, the light shielding portion 10b having a truncated pyramid shape. A rectangular skin observation opening 10c is formed at the tip of the light shielding portion 10b.

  As shown in FIGS. 1 to 4, the unit main body 1 has a substantially rectangular parallelepiped-shaped resin base composed of opposed flat surfaces 4 a and a bottom surface 4 b, and four side surfaces 4 c between the flat surface 4 a and the bottom surface 4 b. A portion 4, a plurality of (eight) LEDs 5 arranged along the four sides of the bottom surface 4 b of the base portion 4 to emit light toward the center of the base portion 4, and the light from the LEDs 5 on the skin of the observation nozzle 10 A mirror 12 for reflecting toward the observation port 10c, an imaging lens 7 as an imaging optical unit incorporated in an opening 4d through which reflected light from the skin S passes in the center of the base portion 4, and a connection A CCD or CMOS image sensor 8 is provided as an image pickup element disposed on the optical axis L of the image lens 7 and fixed to the base portion 4 with a screw via a circuit board 8a.

  On the bottom surface 4 b of the base portion 4, eight concave portions 11 arranged around the opening 4 d are formed. A mirror 12 and an LED 5 are disposed in each recess 11, and the outer end of each recess 11 is opened at the side surface 4 c to allow the LED 5 to be accommodated. And the light radiate | emitted from each LED5 reflects with the mirror 12, and illuminates the skin S. FIG.

  The polarizing filter 2 is affixed to the bottom surface 4b of the base portion 4 and includes a first polarizing filter portion 2A and a second polarizing filter portion 2B having an optical phase difference of 90 degrees. The polarizing filter 2 is formed by punching the cross-shaped first polarizing filter portion 2A from the second polarizing filter portion 2B having a rectangular outer shape, rotating the first polarizing filter portion 2A by 90 degrees, It is formed by returning to the punching hole 2b of the filter portion 2B. The first polarizing filter portion 2A has four convex pieces 2a having the same shape.

  As shown in FIG. 4, the mirror 12 includes a second mirror between the first mirror portion 12A disposed at a position corresponding to each convex piece 2a of the first polarizing filter portion 2A and the adjacent convex piece 2a. And a second mirror unit 12B disposed at a position corresponding to the polarizing filter unit 2B. And the 2nd mirror part 12B is juxtaposed on both sides of the 1st mirror part 12A which opposes, respectively. The correspondence relationship between the mirror 12 and the polarization filter 2 in this case refers to a relationship when viewed from the bottom surface 4b side of the base portion 4 in the extending direction of the optical axis L.

  The LEDs 5 are juxtaposed on both sides of the first light source unit 5A that emits light toward the first mirror unit 12A and the first light source unit 5A facing each other, and emits light toward the second mirror unit 12B. And a second light source unit 5B. And the light radiate | emitted from 1st and 2nd mirror part 12A, 12B illuminates the skin S through the polarizing filter 2 after reflecting with the mirror 12. FIG.

  The LED 5 and the mirror 12 attached to the substrate 5 a have a one-to-one relationship within the recess 11. The LED 5 is set in an LED insertion port 11a formed as an outer end of the concave portion 11 on the side surface 4c of the base portion 4, and the substrate 5a is brought into contact with the side surface 4c of the base portion 4 and fixed by screws 13. Yes. Moreover, each mirror 12 is affixed on the bottom face of the recessed part 11 of the base part 4 so that a reflective surface may face the skin S side.

  In this way, by forming the recess 11 in the bottom surface 4b of the base portion 4, the LED 5 and the mirror 12 do not protrude from the bottom surface 4b of the base portion 4, and the LED 5 and the mirror 12 are securely stored in the base portion 4. Can be made. Furthermore, since the recessed part 11 is open | released by the side surface 4c of the base part 4, the assembly which inserts LED5 from the side surface 4c of the base part 4, and the board | substrate 5a can be arrange | positioned along the side surface 4c of the base part 4. This makes it possible to improve the workability of assembling the LED 5 to the base portion 4.

  The imaging illumination unit U enables observation of texture and spots on the skin S. In order to more effectively observe the texture of the skin S, the LED 5 includes a first light source unit 5A for light bulb color texture observation and a second light source unit for daylight color spot observation. The first light source unit 5 </ b> A and the second light source unit 5 </ b> B are arranged so as to be parallel to a plane orthogonal to the optical axis L of the imaging lens 7. On the two opposite sides of the bottom surface 4b of the base part 4, the first light source part 5A and the second light source parts 5B located on both sides thereof are juxtaposed so that the emission direction is the same, and on the other two sides The first light source unit 5A is arranged.

  Further, when light is applied to the skin S, the incident angle of the light with respect to the optical axis L is different for texture observation and spot observation. The texture observation mirror portion 12A is adhered to the bottom surface 4b of the base portion 4, that is, the bottom surface of the concave portion 11 so that the incident angle α with respect to the optical axis L is 16.5 ± 3 °. The base portion 4 is bonded to the bottom surface 4b, that is, the bottom surface of the recess 11 so that the incident angle β with respect to the optical axis L is 27 ± 3 °. In addition, the polarizing filter 2 is bonded to the bottom surface 4 b of the base portion 4 so as to close each concave portion 11.

  The polarizing filter 2 is disposed inside the imaging lens 7 with the optical axis L as the center, and is disposed outside the first polarizing filter unit 2A for polarizing the P wave and the first polarizing filter unit 2A. In order to polarize the S wave, the second polarizing filter unit 2B having an optical phase difference of 90 degrees with respect to the first polarizing filter unit 2A. The first polarizing filter unit 2A and the second polarizing filter unit 2B are arranged on the same plane (the bottom surface 4b of the base unit 4) orthogonal to the optical axis L of the imaging lens 7. .

  The light from the mirror portion 12A for texture observation has a light bulb color, is reflected by the skin S after passing through the first polarizing filter portion 2A, and is incident again on the first polarizing filter portion 2A. The image is taken by the CMOS image sensor 8 through the imaging lens 7 in 4d. The light from the mirror portion 12B for spot observation is a daylight color, is reflected by the skin S after passing through the second polarizing filter portion 2B, is incident on the first polarizing filter portion 2A, and is opened. The image is taken by the CMOS image sensor 8 through the imaging lens 7 in 4d.

  In such a skin observation device, the light emitted from the LED 5 is reflected by the mirror 12 and then radiated to the skin S. Therefore, uneven illumination is unlikely to occur, and proximity illumination that brings the illumination closer to the skin S is possible. become. Furthermore, when observing the texture and stain of the skin S, it is necessary to set the illumination angle to, for example, an incident angle α (16.5 ± 3 °) and an incident angle β (27 ± 3 °). By simply changing the light reflection angle, different illumination angles for observing the texture and spots of the skin S can be easily created. In this case, it is not necessary to multiplex the arrangement of the LEDs 5 when changing the illumination angle, which contributes to downsizing of the apparatus.

  Further, the polarizing filter 2 is arranged around the first polarizing filter portion 2A having the four convex pieces 2a and the first polarizing filter portion 2A, and is arranged around the first polarizing filter portion 2A. And a second polarizing filter section 2B having an optical phase difference of 90 degrees. Therefore, as shown in FIG. 4, the first mirror part 12A is arranged at a position corresponding to each convex piece 2a of the first polarizing filter part 2A, and the second polarizing filter part is provided between the adjacent convex pieces 2a. The second mirror unit 12B can be arranged at a position corresponding to 2B, and further, the second light source unit can be juxtaposed on both sides of the first light source unit. Accordingly, the first light source unit 5A and the second light source unit 5B can be arranged adjacent to each other, and the first mirror unit 12A and the second mirror unit 12B can be arranged adjacent to each other, and the base unit can be arranged. 4 can be downsized, that is, downsized.

  U ... Imaging illumination unit, S ... Skin, L ... Optical axis, 2 ... Polarization filter, 2a ... Convex piece, 2A ... First polarization filter portion, 2B ... Second polarization filter portion, 4 ... Base portion, 4a ... Plane of base part, 4b ... Bottom of base part, 4c ... Side face of base part, 5 ... LED, 5A ... First light source part, 5B ... Second light source part, 7 ... Imaging optical part (imaging lens) 8 ... imaging device, 11 ... recess, 12 ... mirror, 12A ... first mirror part, 12B ... second mirror part.

Claims (2)

In the skin observation device for observing the skin condition by lighting,
A plurality of LEDs for illuminating the skin;
A polarizing filter disposed on the optical axis between the LED and the skin to transmit light from the LED;
An image sensor that receives reflected light from the skin illuminated by the LED and images the skin;
An imaging optical unit for condensing the reflected light from the skin onto the image sensor;
A mirror that is disposed on the optical axis between the LED and the polarizing filter and makes light incident on the skin by reflection;
The polarizing filter, the mirror, and a base portion to which the LED is fixed,
The polarizing filter is disposed around the first polarizing filter unit, the first polarizing filter unit having a cross shape with four convex pieces, and 90 degrees with respect to the first polarizing filter unit. A second polarizing filter section having an optical phase difference,
The mirror is disposed at a position corresponding to the second polarizing filter section between the first mirror section disposed at a position corresponding to each convex piece of the first polarizing filter section and an adjacent convex piece. A second mirror portion,
The LED includes a first light source unit that emits light toward the first mirror unit, and second light source units juxtaposed on both sides of the first light source unit facing each other. A skin observation device.   The base portion has a substantially rectangular parallelepiped shape including a flat surface and a bottom surface facing each other and four side surfaces between the flat surface and the bottom surface, and the polarizing filter is fixed to the bottom surface of the base portion. The skin observation apparatus according to claim 1, wherein a concave portion that accommodates the LED and the mirror is formed on the bottom surface, and the concave portion is opened at the side surface.

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