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Thursday, December 28, 2017

Recent Canon Patents Involving Mirrorless and DSLR Cameras

Below are a few recent Canon patents involving Mirrorless and DSLR cameras. My readers know from my previous posts Canon is ranked one of the top companies in patents filings.

Hybrid SLR pellicle mirror (Patent #2017-161671)

An imaging device includes: a semi-transmissive mirror that can turn between a first position where subject light is separated to an image pick-up element and a finder and a second position retreating from an imaging optical axis; a light block member that is present at a position not blocking the semi-transmissive mirror when the semi-transmissive mirror (13) is present at the first position, and is configured so as to block the semi-transmissive mirror from an imaging optical axis side when the semi-transmissive mirror is present at the second position; and eyepiece detection means that detects whether a photographer looks into an eyepiece part of the finder. When it is detected by the eyepiece detection means that the photographer does not look into the eyepiece part, the imaging device is configured to move the semi-transmissive mirror and the light block member to the second position.

Anti-reflection lens coating (Patent #2017-167271)

A manufacturing method for an optical member includes: a step of applying dispersion liquid containing particles and dispersant on a base material; a step of, after applying the dispersion liquid, applying a solution containing a binder forming component and causing the solution to enter the space between the particles included in the dispersion liquid applied previously, so as to form a single layer having the binder filling the space between the particles; and a step of drying the layer to form an anti-reflection film. The solution contains a silane alkoxy condensate with an average particle diameter of 8 nm or more and 60 nm or less. The solution contains 70 mass% or more of a solvent whose water solubility is 10 wt% or less.

Improved dual ramp ADC sensor design (Patent #2017-175565)

The present invention relates to a solid-state imaging apparatus comprising: a pixel part; a signal generating part for generating a first ramp signal of which the signal value is changed by a first amount of change per unit time and a second ramp signal of which the signal value is changed by a second amount of charge greater than the first amount of change; and a conversion part which uses the ramp signal from the signal generation part to perform analog/digital conversion on a signal from the pixel part. The signal generation part includes a capacitor part, a current supply part and a charge emission part. The current supply part is connected to the capacitor part and charge is accumulated in the capacitor part, thereby generating the first ramp signal and the second ramp signal. The capacitor part and the charge emission part are connected, thereby emitting the charge accumulated in the capacitor part to the charge emission part. A resistance value of an electrical path between the capacitor part and the charge emission part in generating the second ramp signal is smaller in relative to that in generating the first ramp signal.

17-35 4.0-5.6 IS (Patent #2017-161568)

The zoom lens includes, successively arranged from an object side to an image side, a first lens group having a negative refractive power and a rear group having at least one lens group and having a positive refractive power as a whole. The first lens group is composed of an 11th lens element having a negative refractive power, a 12th lens element having a negative refractive power, and a 13th lens element having a positive refractive power. A focal length fw of the whole system at a wide angle end, a back focus skw at the wide angle end, and a focal length of the 12th lens element are each appropriately set.

Improved heat sinks for mirrorless cameras (Patent #2017-169176)

An imaging apparatus comprises: an imaging element; an element substrate on which the imaging element is mounted on a subject side becoming a front side and an electronic component is mounted on a back side; an element holder positioned and fixed to the imaging element; a base member to which the element holder is fixed by a spring member; and heat radiation members and which have heat absorption parts and, are brought into contact with at least a back of the element substrate and fixed to the base member by the spring member with the element holder. The heat absorption parts and are arranged so that they do not protrude to the back side in an optical axis direction from the electronic component.

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