Structure and method for compensating temperature dependent magnification and focus change
AssigneeBarco N.V.
InventorsHiromitsu Nakano, Daniel Lambot, Koen Van Belle
Life of this patent
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Abstract
A method and device is described for compensating ambient temperature dependent magnification and focus change of a zoom lens system, whereby an ambient temperature compensation structure cooperates with a rotational ring and an optical-element adjusting member such that a phase variation between the rotational ring and the optical-element adjusting member in response to an ambient temperature change is compensated and whereby the phase variation characterizes an optical property of the zoom lens system such as magnification or focus.
Claims14
An A zoom lens system including an ambient temperature compensation structure, comprising:
- an ambient temperature compensation element (2) comprising a first end portion and a second end portion, said first end portion attached (1) to a rotational ring of said zoom lens system and said second end portion attached (1) to an optical-element adjusting member of said zoom lens system;
- and
- whereby said ambient temperature compensation structure cooperates with said rotational ring and said optical-element adjusting member such that a phase variation between said rotational ring and said optical-element adjusting member in response to an ambient temperature change is compensated and whereby said phase variation characterizes an optical property of said zoom lens system such as magnification or focus.
-10. (canceled)
A method for compensating a magnification or focus drift change of a zoom lens device as a result of an ambient temperature, the device comprising a rotation ring and an optical-element adjusting member and an ambient temperature compensation structure, the method comprising causing said ambient thermal compensation structure to respond to a temperature change such that variations in phase between said rotational ring and said optical-element adjusting member are compensated.
Dependencies are inferred from the claim text.