Image retrieving apparatus and optical displacement estimating apparatus

Patent metadata

Field	Value
Publication number	US-9194740-B2
Application number	US-201313792168-A
Country	US
Kind code	B2
Filing date	Mar 10, 2013
Priority date	Oct 4, 2012
Publication date	Nov 24, 2015
Grant date	Nov 24, 2015

Abstract

An image capturing apparatus comprising: a light source, for transmitting incident light to an objective without utilizing any medium besides air, such that the light emits from the objective to generate passing-through light; and a sensor, for capturing an image of the objective according to the passing-through light.

First claim

What is claimed is:

1. An optical displacement estimating apparatus, comprising:
a light source, for transmitting incident light to a finger without utilizing any medium besides air, such that the light emits from the finger to generate passing-through light; and
a sensor, for capturing a finger print image of the finger according to the passing-through light, wherein the finger print image comprises at least one finger print protruding part image and at least one finger print concave part image;
a processing circuit, configured to perform displacement estimating to the finger according to images at different timings;
a light isolating device, located between the sensor and the finger, for isolating light from least one direction, wherein the sensor still can receive the passing-through light via the light isolating device;
a cover, wherein part of the cover is below the sensor and the light isolating device is above the sensor and all the cover.

2. The optical displacement estimating apparatus of claim 1 , wherein the sensor directly receives the passing-through light.

3. The optical displacement estimating apparatus of claim 1 , wherein the light isolating device is a light gate.

4. The optical displacement estimating apparatus of claim 1 , further comprising:
a lens, located between the light isolating device and the sensor.

5. The optical displacement estimating apparatus of claim 1 , wherein the light isolating device makes the passing-through light can only be emitted to the sensor in a direction perpendicular to a receiving surface of the sensor.

6. The optical displacement estimating apparatus of claim 1 , further comprising a thin film located between the sensor and the finger, for refracting the passing-through light to the sensor.

7. The optical displacement estimating apparatus of claim 6 , wherein the thin film is an epoxy thin film, a glass thin film, a glass fiber thin film or an optic fiber thin film.

8. The optical displacement estimating apparatus of claim 1 , wherein a transmitting direction of the incident light is opposite to which of the passing-through light.

Assignees

• Pixart Imaging Inc

Inventors

• Gu Ren-Hau
• Kao Ming-Tsan
• Huang Sen-Huang

Classifications

• G01J1/0411

  using focussing or collimating elements, i.e. lenses or mirrors; Aberration correction · CPC title

• G01J1/08

  Arrangements of light sources specially adapted for photometry {standard sources, also using luminescent or radioactive material} · CPC title

• G01J1/0204 Primary

  Compact construction · CPC title

• G01J1/06

  Restricting the angle of incident light · CPC title

• G01B11/14

  for measuring distance or clearance between spaced objects or spaced apertures (G01B11/26 takes precedence; rangefinders G01C3/00) · CPC title