Lens aligning device and image capturing lens

Patent metadata

Field	Value
Publication number	US-9715077-B2
Application number	US-201213435369-A
Country	US
Kind code	B2
Filing date	Mar 30, 2012
Priority date	Jun 10, 2011
Publication date	Jul 25, 2017
Grant date	Jul 25, 2017

Abstract

A lens aligning device includes: a decentering detection mechanism for measuring a first lens decentering amount; a aligning position calculation control mechanism for calculating a target inter-lens decentering amount by using Formula (1); an adjustment mechanism for moving at least one of a first lens and a second lens so that the inter-lens decentering amount matches the target inter-lens decentering amount.

Inter-lens decentering amount=First lens decentering amount×−2  (1)

First claim

The invention claimed is:

1. A lens aligning device for adjusting a decentering amount of an image capturing lens comprising at least a first lens and a second lens, the first lens and the second lens being arranged, adjacent to each other in this order, between an object and an image surface, said lens aligning device adjusting the image capturing lens by moving at least one of the first lens and the second lens, said lens aligning device comprising:
a CNC (Computerized Numerical Control) image measurement system or a mechanism configured to carry out a reflective decentering measurement for measuring a first lens decentering amount which is a decentering amount of a first lens image side surface of the first lens with respect to a first lens object side surface of the first lens, the first lens object side surface being located on an object side, the first lens image side surface being located on an image surface side;
a CPU ( central process unit) or a hardware logic configured to calculate a target inter-lens decentering amount which is twice as much as the first lens decentering amount and by which a second lens object side surface of the second lens located on the object is shifted (i) with respect to the first lens image side surface and (ii) in a direction opposite a direction in which the first lens image side surface is decentered with respect to the first lens object side surface; and
a manipulator mechanism configured to move at least one of the first lens and the second lens so that an inter-lens decentering amount which is a decentering amount of the second lens object side surface with respect to the first lens image side surface matches the target inter-lens decentering amount.

2. The lens aligning device as set forth in claim 1 , wherein:
the image capturing lens includes (i) a first lens array in which the first lens is provided in a wafer and (ii) a second lens array in which the second lens is provided in a wafer; and
a combination of the first lens in the first lens array and the second lens in the second lens array is used as the image capturing lens.

3. An image capturing lens comprising at least a first lens and a second lens, the first lens and the second lens being arranged, adjacent to each other in this order, between an object and an image surface, a decentering amount of the image capturing lens being adjusted by a lens aligning device, said lens aligning device adjusting the image capturing lens by moving at least one of the first lens and the second lens,
said lens aligning device comprising:
a CNC (Computerized Numerical Control) image measurement system or a mechanism for carrying out reflective decentering measurement configured to measure a first lens decentering amount which is a decentering amount of a first lens image side surface of the first lens with respect to a first lens object side surface of the first lens, the first lens object side surface being located on an object side, the first lens image side surface being located on an image surface side;
a CPU (central processing unit) or a hardware logic configured to calculate a target inter-lens decentering amount which is twice as much as the first lens decentering amount and by which a second lens object side surface of the second lens located on the object side is shifted (i) with respect to the first lens image side surface and (ii) in a direction opposite a direction in which the first lens image side surface is decentered with respect to the first lens object side surface; and
a manipulator mechanism configured to move at least one of the first lens and the second lens so that an inter-lens decentering amount which is a decentering amount of the second lens object side surface with respect to the first lens image side surface matches the target inter-lens decentering amount.

4. The image capturing lens as set forth in claim 3 , wherein:
the first lens is a meniscus lens which has a positive refractive power and a first lens object side surface which is a convex surface; and
the second lens has a negative refractive power.

Assignees

• Shigemitsu Norimichi
• Hanato Hiroyuki
• Sharp Kk

Inventors

• Shigemitsu Norimichi
• Hanato Hiroyuki

Classifications

• G01B11/14

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

• G02B7/005 Primary

  Motorised alignment · CPC title