Portable Animal Defense Device for Unexpected Bear Encounters: Full-Scale Prototype Developed Just Two Months After Patent Grant

ACT-X Inc. (Tokyo) is advancing the development of a 'portable animal defense device' designed to protect users during unexpected encounters with wild animals such as bears.

In recent years, bear sightings and human injuries have been reported across Japan. Encounters in residential areas and school routes are no longer rare, and the proximity between humans and wildlife continues to decrease.

Traditional bear deterrents include bear bells, radios to announce presence, and carrying bear spray—widely known methods primarily aimed at avoiding encounters. However, once an encounter occurs, options to protect humans are limited.

ACT-X is addressing this challenge with a new perspective: 'technology to protect people at the moment of encounter.'

The defense device instantly deploys from a portable state, enveloping the user's upper body with a protective outer shell. A transparent central shield allows users to maintain situational awareness while protected.

Development Background

The project originated from a question sparked by news of bear-related injuries.

Current bear safety measures—such as bells, radios, bear spray, and group travel—are all vital for avoiding encounters and supporting human-wildlife coexistence.

However, completely preventing unexpected encounters is difficult.

Sudden encounters can occur during forestry work, farming, hiking, or even commuting and school travel—common human activity zones.

In such situations, technological options to protect people are scarce.

This led to the idea: perhaps alongside 'avoidance technology,' we also need 'protection technology' that activates at the moment of encounter.

A key focus during development was human instinctive behavior under threat.

When facing imminent danger, people struggle with complex decisions or operations. Therefore, the device must be intuitive and usable by anyone.

The device is designed around the natural human reaction to raise arms forward when threatened. After deployment, the protective shell covers the upper body, while the transparent shield maintains visibility.

This technology is not intended to harm wildlife.

Increasing human protection options can reduce unnecessary human-wildlife conflicts and support coexistence.

Guided by the principle 'protecting people means protecting bears,' ACT-X aims to realize unprecedented protective technology.

Key Features

- Instant deployment from portable state

- Protective outer shell envelops upper body

- Transparent central shield ensures visibility

- Utilizes high-strength material Ultra 200X

- Designed for intuitive operation based on natural human motion

The device is not an offensive tool, but a protective technology developed to save lives in dangerous situations.

Target Users

- Hikers and mountaineers

- Forestry workers

- Farmers

- Wildlife management personnel

- Public transit operators in mountainous regions

- Municipal government staff

- Schools and kindergartens for safety planning

ACT-X aims to make this safety technology accessible not only to professionals but also to the general public.

Protecting People, Protecting Bears

ACT-X holds the belief that 'protecting people means protecting bears.'

When human injuries occur, wildlife may be culled as a response.

Expanding human protection options can reduce such unnecessary conflicts and promote coexistence.

ACT-X will continue development toward a society where humans and wildlife can coexist.

Patent Grant and Full-Scale Prototype

The technology has been granted a patent, and just two months later, a full-scale prototype was developed.

The current prototype consists of a transparent central shield, protective outer shell, and deployment mechanism.

The outer shell uses the high-strength material 'Ultra 200X.'

Manufacturing the prototype required processing of specialized materials vastly different from conventional textiles, involving extensive trial and error.

Though the material appears thin, it gains exceptional rigidity when assembled into a 3D structure.

The sewing process presented unique challenges, such as needing to press and hold the shell in place while stitching—unlike standard sewing techniques.

Through these efforts, ACT-X is now conducting structural verification and improvement tests using the full-scale prototype.


Phased Prototype Development

Rather than moving directly from concept to product, ACT-X has conducted structural validation through multiple prototype models.

[Frame Model]

A skeleton model made of vinyl and TPU tubes

In the initial phase, a transparent vinyl skeleton model was built to verify the deployment mechanism. Deployment speed, shape stability, and post-deployment size were tested to validate the basic structure.

Frame model deployment test

[Standard Fabric Model]

Rear view during deployment of the standard fabric model

Polycarbonate shield component combined with standard fabric model

The next phase involved a model using conventional fabric. Usability, visibility, and post-deployment shape were evaluated with human handling, leading to iterative improvements in structure and dimensions.

Standard fabric model deployment video

[Full-Scale Prototype]

Deployed prototype

The current focus is on developing the full-scale prototype using Ultra 200X. The team is tackling material-specific processing and sewing challenges to balance protection and portability.

Through this phased approach, ACT-X continues validation and refinement toward practical implementation.

The full-scale prototype of the portable animal defense device under development. The deployed protective shell envelops the user's upper body.

Full-scale prototype, user side during deployment

Before deployment, the shield is made of polycarbonate.

Prototype diameter before deployment: 55 cm

Central window diameter: 37 cm

Prototype rear. The dome-shaped protective shell formed by the deployment mechanism protects the user.

Full-scale prototype with transparent central shield. Designed to maintain situational awareness while in protective stance.


Prototype deployment video

Protective Shell Material Comparison Test

For material selection, comparative tests were conducted using multiple fabric types.

Common materials like No. 11 canvas and denim were compared with Ultra 200X, evaluating tear behavior and damage propagation.

This project prioritizes not preventing damage entirely, but ensuring that even if damaged, the shell does not rupture suddenly and maintains protective integrity.

Based on test results, Ultra 200X was selected for the current full-scale prototype.

Further improvements will continue through real-world testing, balancing protection and portability.

※ Video of the comparison test is publicly available.

Video of protective shell material comparison test

Future Plans

ACT-X is currently advancing full-scale prototype development and structural verification.