Instant Film Printer Mechanical Switch Detection

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Solution Overview

Problem

Existing printers and digital cameras with integrated printers face challenges in accurately detecting the distal end of a film without increasing costs, particularly in systems that use instant films.

Innovation Solution

The proposed solution involves a printer design that includes a transport roller pair, an exposure unit, a spreading roller pair, a spreading control member, and a mechanical switch. The mechanical switch is positioned near the spreading control member and is designed to be pressed by the distal end of the film, allowing for accurate detection and synchronization of the exposure head with the film transport.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a photoreflector or detection means is added to detect the film distal end, then detection accuracy is improved, but device complexity and cost increase

Engineering Contradiction:

Improvefilm distal end detection accuracyVSAvoiddetection system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The film unit itself serves as the detection means. The distal end of the film unit directly activates the mechanical switch during transport, eliminating the need for separate detection devices. This self-service approach allows the film to participate in its own detection process, resolving the contradiction between detection accuracy and device complexity

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The detection function is extracted from complex optical or electronic systems and simplified to a basic mechanical switch activation. By removing unnecessary detection components and keeping only the essential mechanical switch, the system achieves accurate film distal end detection without increasing overall device complexity

Inventive Principle:

Principle #2Taking out (Extraction)

2Measurement precision

If a mechanical switch is positioned near the spreading control member, then film distal end detection accuracy is improved, but risk of static electricity interference increases

Engineering Contradiction:

Improvefilm distal end detection accuracyVSAvoidstatic electricity interference

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The spreading control member acts as an intermediary between the film and the mechanical switch. It provides a controlled interface that allows the film distal end to activate the switch while minimizing direct contact and reducing static electricity generation. This mediator approach resolves the contradiction by enabling detection while protecting against harmful static interference

Inventive Principle:

Principle #24Intermediary (Mediator)

3Manufacturing precision

If the exposure head is synchronized with film transport using detection means, then image quality is improved, but cost increases

Engineering Contradiction:

Improveimage positioning precisionVSAvoidproduction cost

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The system uses a simple, inexpensive mechanical switch instead of costly optical or electronic detection systems. The mechanical switch provides sufficient synchronization capability for maintaining image quality while being economically viable. This approach resolves the contradiction by achieving the required precision with a low-cost component

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

Instead of using complex detection means to control the exposure head, the system inverts the approach by using the film's own movement to trigger a simple mechanical switch that then controls the exposure timing. This inversion simplifies the detection system while maintaining synchronization accuracy, resolving the cost-precision contradiction

Inventive Principle:

Principle #13The other way round (Inversion)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This configuration enables accurate detection of the film distal end, ensuring precise synchronization of the exposure process, thereby improving image quality while maintaining cost-effectiveness.

Implementation Method 1

The mechanical switch is positioned near the spreading control member and is designed to be pressed by the distal end of the film, allowing for accurate detection

Methodology Applied

Scientific EffectMechanical contact detection:

Implementation Method 2

The spreading roller pair is disposed on a downstream side in a transport direction with respect to the transport roller pair, and spreads the developer into a gap of the film unit by crushing the developer pod of the exposed film unit

Methodology Applied

Scientific EffectMechanical crushing:

Implementation Method 3

The transport roller pair transports a film unit including a developer pod containing a developer

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS12287561B2Printer and digital camera including printer

Publication Date: 2025.04.29 FUJIFILM CORP

AI summary

A digital camera including a printer includes a transport roller pair that transports an instant film, an exposure unit that exposes an image onto the instant film, a spreading roller pair that spreads a developer into a gap of the instant film by crushing a developer pod of the exposed instant film, a spreading control member that is positioned between the transport roller pair and the spreading roller pair, extends in a width direction of the instant film, and controls the developer spread into the gap, and a mechanical switch that is positioned near the spreading control member.