Image pickup lens unit and image pickup device
First Claim
1. An image pickup lens unit comprising:
- an optical system; and
a plurality of optical elements which form the optical system, wherein;
a plurality of optical elements having optical axes which are aligned are mutually cemented;
side surfaces of the optical elements are disposed in a surface which expands in a direction of the optical axes linearly;
wherein a formula 1.0<
MD/ED<
4.0 is satisfied under the condition that a maximum outermost diameter of the image pickup lens unit in a cross section which crosses orthogonally to the optical axes is defined as an MD and a maximum beam effective diameter in an optical system which is formed by a plurality of the optical elements is defined as an ED.
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Accused Products
Abstract
Lenses 1, 2, and 4 as an optical element having a power are cemented together in an optical axis direction. An optical filter 3 is sandwiched between the lenses 2 and 4. Optical elements neighboring each other are cemented together such that a positioning section which is disposed on a side surface of the optical element disposes an appropriate space in an optical axis direction and optical axes of optical elements align in a direction orthogonal to the optical axis. The cemented optical element arrays are cemented together and cut at a line in a cutting operation. By doing this, it is possible to manufacture a small image pickup lens unit, which can be used in an image pickup device, by mass-production and at a low cost.
68 Citations
15 Claims
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1. An image pickup lens unit comprising:
-
an optical system; and
a plurality of optical elements which form the optical system, wherein;
a plurality of optical elements having optical axes which are aligned are mutually cemented;
side surfaces of the optical elements are disposed in a surface which expands in a direction of the optical axes linearly;
wherein a formula 1.0<
MD/ED<
4.0 is satisfied under the condition that a maximum outermost diameter of the image pickup lens unit in a cross section which crosses orthogonally to the optical axes is defined as an MD and a maximum beam effective diameter in an optical system which is formed by a plurality of the optical elements is defined as an ED. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An image pickup unit having at least three optical elements formed by a first optical element, a second optical element, and a third optical element produced by:
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preparing a first optical element array in which a plurality of the first optical elements are disposed, a second optical element array in which a plurality of the second optical elements are disposed, and a third optical element array in which a plurality of the third optical elements are disposed;
aligning the optical axis of the first optical element and the optical axis of the third optical element and cementing the first optical element array and the third optical element array in the direction of the optical axes of a plurality of the optical elements;
cutting between the neighboring optical elements in a direction of the optical axes of a plurality of the optical elements; and
cementing outer peripheries of each optical elements so as contact with each other wherein conditions ST/TD<
0.7 (condition
1) and MT/TD<
0.5 (condition
2) are satisfied under the condition that;
TD is defined as a surface interval on the optical axis from a first surface of the optical system which is formed by the optical elements that are cemented together to the last surface of the optical system;
ST is defined as a total length of the air intervals on the optical axis; and
MT is defined as a maximum value of the length of the air intervals on the optical axis. - View Dependent Claims (13, 14)
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15. An image pickup unit comprising:
-
an optical system; and
a plurality of optical elements which form the optical system, wherein;
a plurality of optical elements are cemented mutually of which optical axes are aligned;
side surfaces of the optical elements are disposed in a surface which expands in a direction of the optical axes linearly, outer peripheries of each optical elements contact with each other on, a cementing surface wherein a condition 0<
|φ
/φ
A|<
0.5 is satisfied under the condition that;
φ
is defined as a power in the lens surfaces; and
φ
A is defined as a power in an entire optical system in the image pickup lens unit.
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Specification