JP2004313769A5 - - Google Patents

Claims (7)

In a method for adjusting the focus position of an enlarged video module having an objective optical system with an imaging magnification greater than 1 and an image sensor,
Fixing the position of the subject at a predetermined distance with respect to the object-side tip surface of the objective optical system;
Detecting the two positions of the image sensor where the image of the subject has a desired contrast by moving the image sensor;
Obtaining the position of the image sensor that maximizes the contrast of the image of the subject from the two detected positions;
A focus position adjusting method comprising: In a focus position adjusting device for an enlarged video module having an objective optical system with an imaging magnification greater than 1 and an image sensor,
Means for fixing the position of the subject at a predetermined distance with respect to the object-side tip surface of the objective optical system;
Means for moving the image sensor to detect two positions of the image sensor at which a subject image has a desired contrast;
Means for obtaining the position of the image sensor from which the contrast of the image of the subject is maximized from the two detected positions;
A focus position adjusting device comprising: In an enlarged video module with an objective optical system with an imaging magnification greater than 1,
The objective optical system includes, in order from the object side, a front group having a positive focal length, and an aperture stop,
An enlarged video module characterized by satisfying the following conditional expression:
0.9 ≦ | coswy ’/ coswy | ≦ 1.1
0.2 ≦ φ1 / φ2 / f1 ≦ 2
Where wy ′ is the incident angle of the principal ray corresponding to the maximum viewing angle in the enlarged video module to the imaging surface, wy is the half viewing angle, φ1 is the aperture diameter of the aperture stop, and φ2 is the maximum outside of the objective optical system. The diameter, f1, is the focal length of the front group. In an enlarged video module having an objective optical system with an imaging magnification greater than 1 and an image sensor,
An enlarged video module characterized by satisfying the following conditional expression:
0.1 ≦ | p × (NA) ² /(0.61×λ×βo)|≦0.8
Here, p is the pixel size of the image sensor provided in the enlargement video module, NA is the object-side numerical aperture of the objective optical system, λ is the e-line wavelength 0.546 [μm], and βo is the magnification of the objective optical system. In a method for confirming the focus range of an enlarged video module including an objective optical system having an imaging magnification greater than 1 and an image sensor
Bringing a subject into contact with the object-side tip surface of the objective optical system;
Moving the position of the subject in the direction of the optical axis of the objective optical system so as to obtain a predetermined contrast;
Detecting the position of the subject having a predetermined contrast;
A focus range confirmation method comprising: In a focus range confirmation device for an enlarged video module having an objective optical system with an imaging magnification greater than 1 and an image sensor,
Means for bringing a subject into contact with the object-side tip surface of the objective optical system;
Means for moving the position of the subject in the direction of the optical axis of the objective optical system so as to obtain a predetermined contrast;
Means for detecting the position of the subject having a predetermined contrast;
A focus range confirmation device comprising: In an enlarged video module having an objective optical system with an imaging magnification greater than 1 and an image sensor,
An enlarged video module, wherein the focus position is adjusted using the method according to claim 1 .