Photometering lens for SLR camera and adjusting of photometering device
AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha
InventorIsamu Hirai
Life of this patent
Estimating the term…
Abstract
In a photometering lens for an SLR camera in which object light transmitted through a finder screen and emitted from a reflecting optical member is received by a light measuring receiver, wherein the photometering lens has a light path for illumination light upon assembling the light measuring receiver, said illumination light being applied from said reflecting optical member toward the light measuring receiver, and wherein the position of said light measuring receiver is determined in accordance with an image of the light measuring receiver formed on the finder screen. An adjusting method of a photometering device having a photometering lens to adjust the position of the light measuring receiver is also disclosed.
Claims13
A photometering lens for an SLR camera in which object light transmitted through a finder screen and emitted from a reflecting optical member is received by a light measuring receiver to measure the brightness of an object,
- wherein said photometering lens comprises a light path for illumination light upon assembling said light measuring receiver, said illumination light being applied from said reflecting optical member toward said light measuring receiver;
- and
- wherein the position of said light measuring receiver is determined in accordance with an image of said light measuring receiver formed on said finder screen.
An adjusting method for a photometering device having a photometering lens and a light measuring receiver for an SLR camera in which object light transmitted through a finder screen and emitted from a reflecting optical member is received by a light measuring receiver to measure the brightness of an object, the method comprising:
- directing illumination light emitted from a light source redirected by the reflecting optical member to be incident upon an incident light path of the photometering lens, wherein an image of a light receiving surface of the light measuring receiver is formed on the finder screen through the photometering lens and said reflecting optical member by the illumination light reflected by the light receiving surface of the light measuring receiver;
- and
- adjusting the position of the light measuring receiver in accordance with the image of the light receiving surface formed on the finder screen.
Dependencies are inferred from the claim text.