Imaging apparatus and medical equipment

• US 9,064,768 B2
• Filed: 09/30/2013
• Issued: 06/23/2015
• Est. Priority Date: 10/01/2012
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Ishiguro, Hideto, Eguchi, Tsukasa, Fujita, Tetsuji, Yamamoto, Hidetoshi
• Primary Examiner(s): Nguyen, Dao H
• Assistant Examiner(s): Nguyen, Tram H
• Application Number:
  US14/041,400
• Publication Number:
  US 20140091328A1
• Time in Patent Office: 631 Days
• Field of Search: 257/13, 257/40, 257 79-103, 257/918, 257E51015-E51022, 257/E31.058, 257/E31.03, 257/E31.115, 257/E25.032, 257E27133-E27139, 257252-254, 257257-258, 257/22, 257/184, 257/431, 257/432, 257/642, 257/643, 257/759, 257/E37.007, 257E51001-E51052, 257E27117-E27119, 438 22- 47, 438/69, 438/493, 438/503, 438/507, 438/956, 438/82, 438/99, 438/16, 438/65, 348/77, 348/342, 348/E07.085, 348/E05.024, 382/115, 382/124, 382/125, 382/126
• US Class Current: 1/1
• CPC Class Codes: A61B 2010/0009 Testing for drug or alcohol abuse
• CPC Class Codes: A61B 5/14532 for measuring glucose, e.g. by tissue impedance measurement
• CPC Class Codes: A61B 5/1455 using optical sensors, e.g. spectral photometrical oximeters
• CPC Class Codes: G02B 1/11 Anti-reflection coatings
• CPC Class Codes: G02B 27/145 having sequential partially reflecting surfaces
• CPC Class Codes: G06V 40/10 Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
• CPC Class Codes: G06V 40/1318 using electro-optical elements or layers, e.g. electroluminescent sensing
• CPC Class Codes: G06V 40/14 Vascular patterns
• CPC Class Codes: H01L 27/14629 Reflectors
• CPC Class Codes: H01L 31/173 formed in, or on, a common substrate

Abstract

A light receiving section is provided with a plurality of light receiving elements. A light source section is arranged in a subject side of the light receiving section, and is provided with a light emitting section that illuminates the subject and a plurality of transmissive sections that transmits incident light to the light receiving section side. The light emitting section is provided with a first translucent layer, which includes a light emitting layer, and a reflection layer and a semi-transmissive reflection layer, which are opposed each other interposing the first translucent layer, so that a resonance structure that resonates irradiation light from the light emitting layer is formed. Each of the transmissive sections is provided with a second translucent layer, and a first semi-transmissive reflection layer and a second semi-transmissive reflection layer, which are opposed each other interposing the second translucent layer, so that a resonance structure that resonates incident light from the subject side is formed. A resonance length between the reflection layer and the semi-transmissive reflection layer in the light emitting section is more than a resonance length between the first semi-transmissive reflection layer and the second semi-transmissive reflection layer in the transmissive section.

Claims

1. An imaging apparatus comprising:

a light receiving section in which a plurality of light receiving elements is arranged; and

a light source section being arranged in a subject side of the light receiving section and including a light emitting section that emits light toward a subject and a plurality of transmissive sections where incident light from the subject side is transmitted to each of the light receiving elements side;

wherein the light emitting section includes a first translucent layer having light permeability that includes a light emitting layer, a semi-transmissive reflection layer that is located in the subject side of the first translucent layer, and a reflection layer that is opposed to the semi-transmissive reflection layer interposing the first translucent layer, so that a resonation structure that the light emitted from the light emitting layer is resonated between the semi-transmissive reflection layer and the reflection layer is formed,

wherein the plurality of the transmissive sections respectively includes a second translucent layer having light permeability, and a first semi-transmissive reflection layer and a second semi-transmissive reflection layer that are opposed each other interposing the second translucent layer, so that a resonation structure that the incident light from the subject side is resonated between the first semi-transmissive reflection layer and the second semi-transmissive reflection layer is formed, and

wherein a first resonance length between the reflection layer and the semi-transmissive reflection layer in the light emitting section is more than a second resonance length between the first semi-transmissive reflection layer and the second semi-transmissive reflection layer in the transmissive section.

2. The imaging apparatus according to claim 1, further comprising:

a plurality of lenses being arranged in the subject side of the light source section so that the incident light from the subject side is focused to each of the light receiving elements.

3. The imaging apparatus according to claim 1, wherein the first resonance length and the second resonance length are set as to approach between a peak wavelength of irradiation intensity from the light emitting section in a direction inclined with respect to a reference direction, which is perpendicular to a reflection surface of the resonance structure, and a peak wavelength of irradiation intensity from the transmissive section with respect to the reference direction in comparison to a case that the first resonance length and the second resonance length are matched each other.

4. The imaging apparatus according to claim 3, wherein the first resonance wavelength and the second resonance wavelength are set as to match between the peak wavelength of the irradiation intensity from the light emitting section in the direction inclined with respect to the reference direction and the peak wavelength of the irradiation intensity from the transmissive section with respect to the reference direction.

5. The imaging apparatus according to claim 3, wherein an angle of irradiation direction with respect to the reference direction is more than or equal to 30°

and less than or equal to 60°

.

6. The imaging apparatus according to claim 1, wherein the reflection layer of the light emitting section includes a basic reflection layer having light permeability and a dielectric multilayer film, and

the first semi-transmissive reflection layer of the transmissive section includes the dielectric multilayer film and does not include the basic reflection layer.

7. The imaging apparatus according to claim 6, wherein the dielectric multilayer film includes a layer formed by amorphous silicon.

8. The imaging apparatus according to claim 1, wherein the semi-transmissive reflection layer of the light emitting section and the second semi-transmissive reflection layer of the transmissive section are formed by a material having light reflectivity and are formed in a same process.

9. The imaging apparatus according to claim 1, wherein the first translucent layer of the light emitting section includes a transparent electrode layer, which has light permeability, and light emitting layer, and the second translucent layer of the transmissive section includes the light emitting layer and does not include the transparent electrode layer.

10. A medical equipment that estimates biometric information from an image taken by an imaging apparatus comprising the imaging apparatus according to claim 1 is included.