Optical system
AssigneeFUJIFILM Corporation
InventorsHaruhiko MIYAMOTO, Hiroki SAITO, Nobuyuki IWAZAKI
Life of this patent
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Abstract
An optical system includes a compound lens that includes a first lens and a second lens. The first lens is made of a resin, and the second lens is made of glass. In a case where a maximum value of a thickness of the first lens is denoted by A [mm] and a minimum value of the thickness of the first lens is denoted by B [mm], the optical system satisfies Conditional Expressions (1) and (2). A / B ≤ 10 ( 1 ) A ≤ 3 mm ( 2 ) In a case where an amount of plastic deformation of the resin in a state where an indenter is pressed into the resin at a loading rate of 200 mN/10 sec at an environmental temperature of 25° C. is denoted by x [μm], the resin satisfies Conditional Expression (3). 1. μm ≤ x ≤ 4. μm ( 3 )
Claims18
An optical system comprising:
- a compound lens that includes a first lens and a second lens,
- wherein the first lens is made of a resin,
- the second lens is made of glass,
- in a case where a maximum value of a thickness of the first lens is denoted by A [mm] and a minimum value of the thickness of the first lens is denoted by B [mm], Conditional Expressions (1) and (2), which are represented by A/B≤10 (1) and A≤3 mm (2), are satisfied, and
- in a case where an amount of plastic deformation of the resin in a state where an indenter is pressed into the resin at a loading rate of 200 mN/10 sec at an environmental temperature of 25° C. is denoted by x [μm], the resin satisfies Conditional Expression (3) that is represented by 1.0 μm≤x≤4.0 μm (3).
An optical system comprising:
- a compound lens that includes a first lens and a second lens,
- wherein the first lens includes a convex surface and a first surface that protrudes from an outer peripheral edge of the convex surface to an outside in a radial direction of the compound lens,
- the second lens includes a concave surface that is cemented to the convex surface and a second surface that protrudes from an outer peripheral edge of the concave surface to the outside in the radial direction and is cemented to the first surface, and
- in a case where a length of the first surface along the radial direction is denoted by a [μm], a length of the second surface along the radial direction is denoted by b [μm], and a surface roughness of the second surface is denoted by Ra [μm], Conditional Expressions (16) and (17), which are represented by a<b (16) and 5 μm≤a/Ra (17), are satisfied.
Dependencies are inferred from the claim text.